diff --git a/cps/MyLoginManager.py b/cps/MyLoginManager.py
index 419b2e90..44907045 100644
--- a/cps/MyLoginManager.py
+++ b/cps/MyLoginManager.py
@@ -19,14 +19,11 @@
 #
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>.
-import ast
-import hashlib
 
 from .cw_login import LoginManager
 from flask import session
 
 
-
 class MyLoginManager(LoginManager):
     def _session_protection_failed(self):
         sess = session._get_current_object()
diff --git a/cps/cw_login/login_manager.py b/cps/cw_login/login_manager.py
index bf0efbc7..21dc803d 100644
--- a/cps/cw_login/login_manager.py
+++ b/cps/cw_login/login_manager.py
@@ -397,7 +397,7 @@ class LoginManager:
 
     def _load_user_from_remember_cookie(self, cookie):
         signer_kwargs = dict(
-            key_derivation="hmac", digest_method=staticmethod(hashlib.sha1)
+            key_derivation="hmac", digest_method=hashlib.sha1
         )
         try:
             remember_dict = URLSafeSerializer(
@@ -482,7 +482,7 @@ class LoginManager:
         # prepare data
         max_age = int(current_app.permanent_session_lifetime.total_seconds())
         signer_kwargs = dict(
-            key_derivation="hmac", digest_method=staticmethod(hashlib.sha1)
+            key_derivation="hmac", digest_method=hashlib.sha1
         )
         # save
         data = URLSafeSerializer(
diff --git a/cps/editbooks.py b/cps/editbooks.py
index 84299c63..5f58cf81 100644
--- a/cps/editbooks.py
+++ b/cps/editbooks.py
@@ -134,8 +134,9 @@ def edit_book(book_id):
         # handle upload other formats from local disk
         meta = upload_single_file(request, book, book_id)
         # only merge metadata if file was uploaded and no error occurred (meta equals not false or none)
+        upload_format = False
         if meta:
-            merge_metadata(to_save, meta)
+            upload_format = merge_metadata(to_save, meta)
         # handle upload covers from local disk
         cover_upload_success = upload_cover(request, book)
         if cover_upload_success:
@@ -179,7 +180,7 @@ def edit_book(book_id):
         modify_date |= edit_book_publisher(to_save['publisher'], book)
         # handle book languages
         try:
-            modify_date |= edit_book_languages(to_save['languages'], book)
+            modify_date |= edit_book_languages(to_save['languages'], book, upload_format)
         except ValueError as e:
             flash(str(e), category="error")
             edit_error = True
@@ -575,6 +576,10 @@ def merge_metadata(to_save, meta):
         to_save['author_name'] = ''
     if to_save.get('book_title', "") == _('Unknown'):
         to_save['book_title'] = ''
+    if not to_save["languages"] and meta.languages:
+        upload_language = True
+    else:
+        upload_language = False
     for s_field, m_field in [
             ('tags', 'tags'), ('author_name', 'author'), ('series', 'series'),
             ('series_index', 'series_id'), ('languages', 'languages'),
@@ -582,7 +587,7 @@ def merge_metadata(to_save, meta):
         to_save[s_field] = to_save[s_field] or getattr(meta, m_field, '')
     to_save["description"] = to_save["description"] or Markup(
         getattr(meta, 'description', '')).unescape()
-
+    return upload_language
 
 def identifier_list(to_save, book):
     """Generate a list of Identifiers from form information"""
diff --git a/cps/embed_helper.py b/cps/embed_helper.py
index 71de216d..54db47ef 100644
--- a/cps/embed_helper.py
+++ b/cps/embed_helper.py
@@ -28,7 +28,7 @@ log = logger.create()
 
 def do_calibre_export(book_id, book_format):
     try:
-        quotes = [3, 5, 7, 9]
+        quotes = [4, 6]
         tmp_dir = get_temp_dir()
         calibredb_binarypath = get_calibre_binarypath("calibredb")
         temp_file_name = str(uuid4())
diff --git a/cps/helper.py b/cps/helper.py
index 08fa1387..004e1b0e 100644
--- a/cps/helper.py
+++ b/cps/helper.py
@@ -413,36 +413,6 @@ def rename_all_files_on_change(one_book, new_path, old_path, all_new_name, gdriv
         file_format.name = all_new_name
 
 
-'''def rename_all_authors(first_author, renamed_author, calibre_path="", localbook=None, gdrive=False):
-    # Create new_author_dir from parameter or from database
-    # Create new title_dir from database and add id
-    if first_author:
-        new_authordir = get_valid_filename(first_author, chars=96)
-        for r in renamed_author:
-            new_author = calibre_db.session.query(db.Authors).filter(db.Authors.name == r).first()
-            old_author_dir = get_valid_filename(r, chars=96)
-            new_author_rename_dir = get_valid_filename(new_author.name, chars=96)
-            if gdrive:
-                g_file = gd.getFileFromEbooksFolder(None, old_author_dir)
-                if g_file:
-                    gd.moveGdriveFolderRemote(g_file, new_author_rename_dir)
-                    gd.updateDatabaseOnEdit(g_file['id'], new_author_rename_dir)
-            else:
-                if os.path.isdir(os.path.join(calibre_path, old_author_dir)):
-                    old_author_path = os.path.join(calibre_path, old_author_dir)
-                    new_author_path = os.path.join(calibre_path, new_author_rename_dir)
-                    try:
-                        shutil.move(os.path.normcase(old_author_path), os.path.normcase(new_author_path))
-                    except OSError as ex:
-                        log.error("Rename author from: %s to %s: %s", old_author_path, new_author_path, ex)
-                        log.debug(ex, exc_info=True)
-                        return _("Rename author from: '%(src)s' to '%(dest)s' failed with error: %(error)s",
-                                 src=old_author_path, dest=new_author_path, error=str(ex))
-    else:
-        new_authordir = get_valid_filename(localbook.authors[0].name, chars=96)
-    return new_authordir'''
-
-
 def rename_author_path(first_author, old_author_dir, renamed_author, calibre_path="", gdrive=False):
     # Create new_author_dir from parameter or from database
     # Create new title_dir from database and add id
@@ -459,12 +429,15 @@ def rename_author_path(first_author, old_author_dir, renamed_author, calibre_pat
             old_author_path = os.path.join(calibre_path, old_author_dir)
             new_author_path = os.path.join(calibre_path, new_author_rename_dir)
             try:
-                shutil.move(old_author_path, new_author_path)
-            except OSError as ex:
-                log.error("Rename author from: %s to %s: %s", old_author_path, new_author_path, ex)
-                log.debug(ex, exc_info=True)
-                return _("Rename author from: '%(src)s' to '%(dest)s' failed with error: %(error)s",
-                         src=old_author_path, dest=new_author_path, error=str(ex))
+                os.rename(old_author_path, new_author_path)
+            except OSError:
+                try:
+                    shutil.move(old_author_path, new_author_path)
+                except OSError as ex:
+                    log.error("Rename author from: %s to %s: %s", old_author_path, new_author_path, ex)
+                    log.error_or_exception(ex)
+                    raise Exception(_("Rename author from: '%(src)s' to '%(dest)s' failed with error: %(error)s",
+                             src=old_author_path, dest=new_author_path, error=str(ex)))
     return new_authordir
 
 # Moves files in file storage during author/title rename, or from temp dir to file storage
diff --git a/cps/main.py b/cps/main.py
index 6afb18af..1b3b40b4 100644
--- a/cps/main.py
+++ b/cps/main.py
@@ -20,7 +20,6 @@ import sys
 
 from . import create_app, limiter
 from .jinjia import jinjia
-from .remotelogin import remotelogin
 from flask import request
 
 
@@ -42,6 +41,7 @@ def main():
     from .shelf import shelf
     from .tasks_status import tasks
     from .error_handler import init_errorhandler
+    from .remotelogin import remotelogin
     try:
         from .kobo import kobo, get_kobo_activated
         from .kobo_auth import kobo_auth
diff --git a/cps/static/js/reading/epub.js b/cps/static/js/reading/epub.js
index 5047b1d3..a552da05 100644
--- a/cps/static/js/reading/epub.js
+++ b/cps/static/js/reading/epub.js
@@ -79,6 +79,6 @@ var reader;
     }
     
     // Default settings load
-    const theme = localStorage.getItem("calibre.reader.theme") ?? Object.keys(themes)[0];
+    const theme = localStorage.getItem("calibre.reader.theme") ?? "lightTheme";
     selectTheme(theme);
 })();
diff --git a/cps/tasks/convert.py b/cps/tasks/convert.py
index e6af356f..3bef81a9 100644
--- a/cps/tasks/convert.py
+++ b/cps/tasks/convert.py
@@ -255,7 +255,7 @@ class TaskConvert(CalibreTask):
         try:
             # path_tmp_opf = self._embed_metadata()
             if config.config_embed_metadata:
-                quotes = [3, 5]
+                quotes = [5]
                 tmp_dir = get_temp_dir()
                 calibredb_binarypath = os.path.join(config.config_binariesdir, SUPPORTED_CALIBRE_BINARIES["calibredb"])
                 my_env = os.environ.copy()
diff --git a/cps/tasks/database.py b/cps/tasks/database.py
index e5aa26da..c9c30d43 100644
--- a/cps/tasks/database.py
+++ b/cps/tasks/database.py
@@ -16,11 +16,9 @@
 #   You should have received a copy of the GNU General Public License
 #   along with this program. If not, see <http://www.gnu.org/licenses/>.
 
-from urllib.request import urlopen
-
 from flask_babel import lazy_gettext as N_
 
-from cps import config, logger
+from cps import config, logger, db, ub
 from cps.services.worker import CalibreTask
 
 
@@ -28,18 +26,12 @@ class TaskReconnectDatabase(CalibreTask):
     def __init__(self, task_message=N_('Reconnecting Calibre database')):
         super(TaskReconnectDatabase, self).__init__(task_message)
         self.log = logger.create()
-        self.listen_address = config.get_config_ipaddress()
-        self.listen_port = config.config_port
+        self.calibre_db = db.CalibreDB(expire_on_commit=False, init=True)
 
     def run(self, worker_thread):
-        address = self.listen_address if self.listen_address else 'localhost'
-        port = self.listen_port if self.listen_port else 8083
-
-        try:
-            urlopen('http://' + address + ':' + str(port) + '/reconnect')
-            self._handleSuccess()
-        except Exception as ex:
-            self._handleError('Unable to reconnect Calibre database: ' + str(ex))
+        self.calibre_db.reconnect_db(config, ub.app_DB_path)
+        self.calibre_db.session.close()
+        self._handleSuccess()
 
     @property
     def name(self):
diff --git a/cps/tasks/thumbnail.py b/cps/tasks/thumbnail.py
index 2921ffc9..d2179dd9 100644
--- a/cps/tasks/thumbnail.py
+++ b/cps/tasks/thumbnail.py
@@ -70,7 +70,6 @@ class TaskGenerateCoverThumbnails(CalibreTask):
         self.log = logger.create()
         self.book_id = book_id
         self.app_db_session = ub.get_new_session_instance()
-        # self.calibre_db = db.CalibreDB(expire_on_commit=False, init=True)
         self.cache = fs.FileSystem()
         self.resolutions = [
             constants.COVER_THUMBNAIL_SMALL,
diff --git a/cps/web.py b/cps/web.py
index 7da22e3a..2519ebd5 100644
--- a/cps/web.py
+++ b/cps/web.py
@@ -89,21 +89,21 @@ except ImportError:
 def add_security_headers(resp):
     default_src = ([host.strip() for host in config.config_trustedhosts.split(',') if host] +
                    ["'self'", "'unsafe-inline'", "'unsafe-eval'"])
-    csp = "default-src " + ' '.join(default_src) + "; "
-    csp += "font-src 'self' data:"
+    csp = "default-src " + ' '.join(default_src)
+    if request.endpoint == "web.read_book" and config.config_use_google_drive:
+        csp +=" blob: "
+    csp += "; font-src 'self' data:"
     if request.endpoint == "web.read_book":
-        csp += " blob:"
+        csp += " blob: "
     csp += "; img-src 'self'"
     if request.path.startswith("/author/") and config.config_use_goodreads:
         csp += " images.gr-assets.com i.gr-assets.com s.gr-assets.com"
     csp += " data:"
     if request.endpoint == "edit-book.show_edit_book" or config.config_use_google_drive:
-        csp += " *;"
-    elif request.endpoint == "web.read_book":
-        csp += " blob:; style-src-elem 'self' blob: 'unsafe-inline';"
-    else:
-        csp += ";"
-    csp += " object-src 'none';"
+        csp += " *"
+    if request.endpoint == "web.read_book":
+        csp += " blob: ; style-src-elem 'self' blob: 'unsafe-inline'"
+    csp += "; object-src 'none';"
     resp.headers['Content-Security-Policy'] = csp
     resp.headers['X-Content-Type-Options'] = 'nosniff'
     resp.headers['X-Frame-Options'] = 'SAMEORIGIN'
diff --git a/requirements.txt b/requirements.txt
index fd6a808c..460a7357 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,6 @@
-Werkzeug<3.0.0
 APScheduler>=3.6.3,<3.11.0
 Babel>=1.3,<3.0
 Flask-Babel>=0.11.1,<4.1.0
-# Flask-Login>=0.3.2,<0.6.4
 Flask-Principal>=0.3.2,<0.5.1
 Flask>=1.0.2,<3.1.0
 iso-639>=0.4.5,<0.5.0
@@ -17,8 +15,8 @@ lxml>=4.9.1,<5.3.0
 flask-wtf>=0.14.2,<1.3.0
 chardet>=3.0.0,<4.1.0
 advocate>=1.0.0,<1.1.0
-Flask-Limiter>=2.3.0,<3.6.0
+Flask-Limiter>=2.3.0,<3.9.0
 regex>=2022.3.2,<2024.6.25
 bleach>=6.0.0,<6.2.0
 python-magic>=0.4.27,<0.5.0
-flask-httpAuth>=4.4.0
+flask-httpAuth>=4.4.0,<5.0.0