Last warning

Also read this:
viewtopic.php?f=4&t=3
Carefully.

Test again with only MaxDps and class module enabled.

Good lord... read description of MaxDps on Curse or Wowinterface.

In fact, your implementation seems to be correct. But there was a bug in DiabolicUI how they handle action slots. Had to make workaround.

I just pushed support for Diabolic UI.

Why people make new threads when answers are usually handled on a silver plate?
viewtopic.php?f=4&t=77

TLDR:
I can do it IF:
1. Addon is not retarded (Action Bar in your case Diablo UI)
2. You will be able to sit down with me and test things.

So you did not install it properly, as I thought. Overriding files is NOT a proper way to install it.

You can use every possible texture from a game, there is a field named: Custom Texture.
You just need to know the path to it.

How? I am 99% sure you didn't do it properly.