Note: Cannot test this with Angry Keystones only. I had to at least load HandyNotes. When you right-click to access the menu, the background is gone. If I have only HandyNotes installed, background is there.

The error also happens with AK and WeakAura's only, right-click on a WeakAura, background will be gone. Without AK, everything is there.

I just released v0.26.5 with a possible fix, do you still get this issue with that?

Just tested, this fixes that issue. Thanks.