This problem usually happens when the wrong CM11 Themes is installed on your device. There are two ways to fix stuck at the boot logo screen.

1.Flashing Patch File
If for any reason your devices fails to boot after using with a CM11 Theme Boot Animation, just simply flashing this patch zip file in recovery.

2.Use File Manager TWRP or Aroma File Manager on CWM
Just browse to data/system/theme/ and delete