diff --git a/parts/gameFuncs.lua b/parts/gameFuncs.lua
index e701217d..8577b838 100644
--- a/parts/gameFuncs.lua
+++ b/parts/gameFuncs.lua
@@ -161,8 +161,12 @@ do-- function applySettings()
         if SETTING.bg=='on' then
             BG.unlock()
             BG.setDefault(SETTING.defaultBG)
+            if SETTING.lockBG then
+                BG.lock()
+            elseif reason=='lockBG' then        -- Don't load theme too soon!
+                THEME.set(THEME.calculate(),GAME.playing)
+            end
             BG.set()
-            if SETTING.lockBG then BG.lock() end
         elseif SETTING.bg=='off' then
             BG.unlock()
             BG.set('fixColor',SETTING.bgAlpha,SETTING.bgAlpha,SETTING.bgAlpha)
diff --git a/parts/scenes/customGame.lua b/parts/scenes/customGame.lua
index 356e0cbd..4d6826a7 100644
--- a/parts/scenes/customGame.lua
+++ b/parts/scenes/customGame.lua
@@ -350,7 +350,7 @@ scene.widgetList={
     WIDGET.newSwitch{name='phyHold',       x=560, y=1030,lim=200,                   disp=CUSval('phyHold'),code=CUSrev('phyHold'),hideF=function() return CUSTOMGAME_LOCAL.customenv.holdCount==0 end},
 
     -- BG & BGM
-    WIDGET.newSelector{name='bg',          x=840, y=1100,w=250,color='Y',list=BG.getList(),disp=CUSval('bg'),code=function(i) CUSTOMGAME_LOCAL.customenv.bg=i BG.set(i) end},
+    WIDGET.newSelector{name='bg',          x=840, y=1100,w=250,color='Y',list=BG.getList(),disp=CUSval('bg'),code=function(i) CUSTOMGAME_LOCAL.customenv.bg=i BG.set(i) end,hideF=SETval('lockBG')},
     WIDGET.newSelector{name='bgm',         x=1120,y=1100,w=250,color='Y',list=BGM.getList(),disp=CUSval('bgm'),code=function(i) CUSTOMGAME_LOCAL.customenv.bgm=i BGM.play(i) end},
 }
 
diff --git a/parts/scenes/setting_video.lua b/parts/scenes/setting_video.lua
index 57f96c09..e916a0fc 100644
--- a/parts/scenes/setting_video.lua
+++ b/parts/scenes/setting_video.lua
@@ -135,7 +135,7 @@ scene.widgetList={
         disp=SETval('lockBG'),
         code=function()
             SETTING.lockBG=not SETTING.lockBG
-            applySettings()
+            applySettings('lockBG')
         end,
         hideF=function() return SETTING.bg~='on' end
     },
@@ -150,7 +150,7 @@ scene.widgetList={
                     MES.new('warn',text.settingWarn2,6.26)
                 end
             else
-                THEME.set(THEME.calculate())
+                THEME.set(THEME.calculate(),GAME.playing)
                 WIDGET.setWidgetList(scene.widgetList)
             end
         end
diff --git a/parts/theme.lua b/parts/theme.lua
index 2e0307ec..6cd65ca2 100644
--- a/parts/theme.lua
+++ b/parts/theme.lua
@@ -58,7 +58,7 @@ function THEME.calculate(Y,M,D)
         )
 end
 
-function THEME.set(theme)
+function THEME.set(theme,keepBGM)
     if type(theme)=='string' and theme:sub(1,6)=='season' then
         BG.setDefault(SETTING.defaultBG)
         BGM.setDefault(({season1='null',season2='nil',season3='vaccum',season4='space'})[theme])
@@ -99,7 +99,7 @@ function THEME.set(theme)
 
     THEME.cur=theme
     BG.set()
-    BGM.play()
+    if not keepBGM then BGM.play() end
     return true
 end