diff --git a/src/demo/xray.c b/src/demo/xray.c
index dfa75cffd..e300500c2 100644
--- a/src/demo/xray.c
+++ b/src/demo/xray.c
@@ -65,7 +65,9 @@ perframecb(struct ncvisual* ncv, struct ncvisual_options* vopts,
   // only need these two steps done once, but we can't do them in
   // main() due to the plane being created in ncvisual_stream() =[
   ncplane_set_resizecb(vopts->n, ncplane_resize_maximize);
-  ncplane_move_above(vopts->n, vnewplane);
+  // until #1518 is done, the stream isn't transparent, and thus it
+  // can obstruct the slider if there are few enough rows. FIXME
+  ncplane_move_above(vnewplane, vopts->n);
 
   struct notcurses* nc = ncplane_notcurses(vopts->n);
   static int frameno = 0;
diff --git a/src/lib/blit.c b/src/lib/blit.c
index 665177a16..277059848 100644
--- a/src/lib/blit.c
+++ b/src/lib/blit.c
@@ -615,7 +615,7 @@ sex_trans_check(cell* c, const uint32_t rgbas[6], unsigned blendcolors){
       ++div;
     }
   }
-  if(transstring == 0){
+  if(transstring == 0){ // there was no transparency
     return NULL;
   }
   cell_set_bg_alpha(c, CELL_ALPHA_TRANSPARENT);
@@ -685,7 +685,7 @@ sextant_blit(ncplane* nc, int linesize, const void* data,
       c->channels = 0;
       c->stylemask = 0;
       const char* egc = sex_trans_check(c, rgbas, bargs->u.cell.blendcolors);
-      if(egc == NULL){
+      if(egc == NULL){ // no transparency; run a full solver
         egc = sex_solver(rgbas, &c->channels, bargs->u.cell.blendcolors);
         cell_set_blitquadrants(c, 1, 1, 1, 1);
       }
diff --git a/src/lib/sixel.c b/src/lib/sixel.c
index 307eaba58..bb90a4be7 100644
--- a/src/lib/sixel.c
+++ b/src/lib/sixel.c
@@ -321,7 +321,8 @@ write_sixel_data(FILE* fp, int leny, int lenx, const sixeltable* stab, int* pars
   // Set Raster Attributes - pan/pad=1 (pixel aspect ratio), Ph=lenx, Pv=leny
   // using Ph/Pv causes a background to be drawn using color register 0 for all
   // unspecified pixels, which we do not want.
-  fprintf(fp, "\"1;2;%d;%d", lenx, leny);
+  //fprintf(fp, "\"1;0;%d;%d", lenx, leny);
+  (void)leny;
 
   for(int i = 0 ; i < stab->colors ; ++i){
     const unsigned char* rgb = stab->table + i * CENTSIZE;