Just out of curiosity have you tried a clean install of DG?
I have not seen that error yet. I have seen a bunch of new ones that cripple wows spell bars unless you /reload or when using the ui setup causing error requiring disable or ignore.
Usually I nuke out the old install of dugi and reinstall and it plays nicely again that is why I asked.
However the current is not playing well with the UI changes in client and I feel the Blame to the issue falls on blizzard and their major rework and even more limitations to client assets.