Currently I have my wallpaper set to show the album art in the background when music is playing, and also in a circle that lines up with a Kustom widget when I scroll to that page. Occasionally, when skipping through music (I use Black Player Ex) I will get a message saying "Unfortunately, Kustom Live Wallpaper has stopped." I can get the wallpaper working again by changing wallpapers and the changing back to KLWP, or by restarting my device. This is a very annoying issue, so any help is greatly appreciated.
This is fixed in 3.22, please reopen if you are still having issues (final should be out in 1 week, beta is available at http://kustom.rocks/klwp/apk)