Quote Originally Posted by Ughmahedhurtz View Post
I would login one character and see if you can identify when it gets stuck. Stuck casting situations have usually (for me anyway) been a case of a spell in a macro failing to trigger (invalid name/typo, cooldown not reached, etc.). Worth a look anyway.
I've had to do some tedious work, but I have found what was causing an issue.

One of the lines of code in ElvUI was conflicting with ISBoxer. Don't ask me how, I have no idea. But the maker of Skullflower UI was able to have a look. It was something to do with the unitframes. :O