After rereading your posts, I just noticed that you added to one of them that your running cm... This won't work on aosp, only stock lg roms.After I moved the .apk to the /system/app and restarted, I put this in the adb on my computer:
am start -a android.intent.action.MAIN -n com.lge.hiddenmenu/com.lge.hiddenmenu.HiddenMenu
The hiddenmenu popped up but all it said was null