diff --git a/apps/qmsched/app.js b/apps/qmsched/app.js
index 8e1141058..cc698ae1d 100644
--- a/apps/qmsched/app.js
+++ b/apps/qmsched/app.js
@@ -84,7 +84,6 @@ function formatTime(t) {
  */
 function applyTheme() {
   const theme = (STORAGE.readJSON("setting.json", 1) || {}).theme;
-  if (theme && theme.dark===g.theme.dark) return; // already correct
   g.theme = theme;
   delete g.reset;
   g._reset = g.reset;
@@ -105,24 +104,8 @@ function showThemeMenu(back, quiet){
   function cl(x) { return g.setColor(x).getColor(); }
   var themesMenu = {
     '':{title:/*LANG*/'Theme', back: back},
-    /*LANG*/'Dark BW': ()=>{
-      set(option, {
-        fg:cl("#fff"), bg:cl("#000"),
-        fg2:cl("#fff"), bg2:cl("#004"),
-        fgH:cl("#fff"), bgH:cl("#00f"),
-        dark:true,
-        quiet: true
-      });
-      back();
-    },
-    /*LANG*/'Light BW': ()=>{
-      set(option, {
-        fg:cl("#000"), bg:cl("#fff"),
-        fg2:cl("#000"), bg2:cl("#cff"),
-        fgH:cl("#000"), bgH:cl("#0ff"),
-        dark:false,
-        quiet: true
-      });
+    /*LANG*/'Default': ()=>{
+      unset(option);
       back();
     }
   };
@@ -131,14 +114,8 @@ function showThemeMenu(back, quiet){
     n => {
       let newTheme = STORAGE.readJSON(n);
       themesMenu[newTheme.name ? newTheme.name : n] = () => {
-        set(option, {
-        fg:cl(newTheme.fg), bg:cl(newTheme.bg),
-        fg2:cl(newTheme.fg2), bg2:cl(newTheme.bg2),
-        fgH:cl(newTheme.fgH), bgH:cl(newTheme.bgH),
-        dark:newTheme.dark,
-        quiet: quiet
-      });
-      back();
+        set(option, n);
+        back();
       };
     }
   );
diff --git a/apps/qmsched/lib.js b/apps/qmsched/lib.js
index f6107df5f..1d636f263 100644
--- a/apps/qmsched/lib.js
+++ b/apps/qmsched/lib.js
@@ -3,37 +3,70 @@
  * @param {int} mode Quiet Mode
  */
 function switchTheme(mode) {
-  let s = require("Storage").readJSON("setting.json", 1) || {};
-  if (!!mode === s.theme.quiet) return; // nothing to do
-  // default themes, copied from settings.js:showThemeMenu()
   function cl(x) { return g.setColor(x).getColor(); }
+  const readTheme = function(name) {
+    const n = require("Storage").readJSON(name);
+    return {
+      fg:cl(n.fg), bg:cl(n.bg),
+      fg2:cl(n.fg2), bg2:cl(n.bg2),
+      fgH:cl(n.fgH), bgH:cl(n.bgH),
+      dark:n.dark
+    };
+  }
+  const s = require("Storage").readJSON("setting.json", 1) || {};
+  // default themes, copied from settings.js:showThemeMenu()
 
-  let q = require("Storage").readJSON("qmsched.json", 1) || {};
+  const q = require("Storage").readJSON("qmsched.json", 1) || {};
   let quietTheme = {
     // 'Dark BW'
-    fg: cl("#fff"), bg: cl("#000"),
-    fg2: cl("#0ff"), bg2: cl("#000"),
-    fgH: cl("#fff"), bgH: cl("#00f"),
-    dark: true,
-    quiet: true
+    fg:cl("#fff"), bg:cl("#000"),
+    fg2:cl("#fff"), bg2:cl("#004"),
+    fgH:cl("#fff"), bgH:cl("#00f"),
+    dark:true
   };
   let normalTheme = {
     // 'Light BW'
-    fg: cl("#000"), bg: cl("#fff"),
-    fg2: cl("#000"), bg2: cl("#cff"),
-    fgH: cl("#000"), bgH: cl("#0ff"),
-    dark: false,
-    quiet: false
+    fg:cl("#000"), bg:cl("#fff"),
+    fg2:cl("#000"), bg2:cl("#cff"),
+    fgH:cl("#000"), bgH:cl("#0ff"),
+    dark:false
   };
 
-  if (q.normalTheme) normalTheme = q.normalTheme;
-  if (q.quietTheme) quietTheme = q.quietTheme;
+  let miss = false;
 
-  s.theme = mode ? quietTheme : normalTheme;
+  // ensure referenced theme files actually exist or remove reference
+  if (q.normalTheme && require("Storage").read(q.normalTheme) == undefined){
+    delete q.normalTheme;
+    miss = true;
+  }
+  if (q.quietTheme && require("Storage").read(q.quietTheme) == undefined){
+    delete q.quietTheme;
+    miss = true;
+  }
+  if (miss) 
+    require("Storage").writeJSON("qmsched.json", q);
 
-  require("Storage").writeJSON("setting.json", s);
-  // reload clocks with new theme, otherwise just wait for user to switch apps
-  if (Bangle.CLOCK) load(global.__FILE__);
+  // load theme files
+  if (q.normalTheme)
+    normalTheme = readTheme(q.normalTheme);
+  if (q.quietTheme)
+    quietTheme = readTheme(q.quietTheme);
+
+
+  const newTheme = mode ? quietTheme : normalTheme;
+  let changed = false;
+  for (const c in newTheme) {
+      if (!(c in g.theme) || newTheme[c] !== g.theme[c]) {
+          changed = true;
+          break;
+      }
+  }
+  if (changed) {
+    s.theme = newTheme;
+    require("Storage").writeJSON("setting.json", s);
+    // reload clocks with new theme, otherwise just wait for user to switch apps
+    if (Bangle.CLOCK) load(global.__FILE__);
+  }
 }
 /**
  * Apply LCD options and theme for given mode