diff --git a/src/in_memory_undo.c b/src/in_memory_undo.c
index 5c553cb5..bcd5e819 100644
--- a/src/in_memory_undo.c
+++ b/src/in_memory_undo.c
@@ -444,12 +444,6 @@ void mem_push_undo(void)
   xctx->tail_undo_ptr = xctx->head_undo_ptr <= MAX_UNDO? 0: xctx->head_undo_ptr-MAX_UNDO;
 }
 
-/* BUG: in_memory_undo does not save/restore embedded symbols, it just saves references to symbols
- * if symbols are not found in library you get a schematic with missing symbols if you remove 
- * symbols and do an undo (this is done in netlist operations to purge unused syms
- * if symbols are found in library your schematic will be linked with library symbols and this
- * is not the intended behavior */
-
 /* redo:
  * 0: undo (with push current state for allowing following redo) 
  * 1: redo
diff --git a/src/scheduler.c b/src/scheduler.c
index 9bf9a39a..82a0c05f 100644
--- a/src/scheduler.c
+++ b/src/scheduler.c
@@ -163,7 +163,7 @@ int xschem(ClientData clientdata, Tcl_Interp *interp, int argc, const char * arg
       Tcl_ResetResult(interp);
     }
    
-    else if(!strcmp(argv[1],"change_colors"))
+    else if(!strcmp(argv[1],"build_colors"))
     {
       cmd_found = 1;
       build_colors(tclgetdoublevar("dim_value"), tclgetdoublevar("dim_bg"));
diff --git a/src/xschem.tcl b/src/xschem.tcl
index 320f780d..a4339758 100644
--- a/src/xschem.tcl
+++ b/src/xschem.tcl
@@ -2438,7 +2438,7 @@ proc change_color {} {
     regsub -all {"} $colors {} svg_colors
     regsub -all {#} $svg_colors {0x} svg_colors
 
-    xschem change_colors
+    xschem build_colors
     xschem redraw
     set    savedata "#### THIS FILE IS AUTOMATICALLY GENERATED BY XSCHEM, DO NOT EDIT.\n"
     append savedata "set cadlayers $cadlayers\n"
@@ -4079,12 +4079,12 @@ proc build_widgets { {topwin {} } } {
   $topwin.menubar.view.menu add checkbutton -label "Increment Hilight Color" -variable incr_hilight
   $topwin.menubar.view.menu add command -label "Toggle colorscheme"  -accelerator {Shift+O} -command {
           xschem toggle_colorscheme
-          xschem change_colors 1
+          xschem build_colors 1
           xschem redraw
        }
    toolbar_create ViewToggleColors {
           xschem toggle_colorscheme
-          xschem change_colors 1
+          xschem build_colors 1
           xschem redraw
        } "Toggle Color Scheme" $topwin
   $topwin.menubar.view.menu add command -label "Dim colors"  -accelerator {} -command {