ok, so I just upgraded to the 5.03.03 Dev version. And yes, I'm having the same issues with my DK. I am also having some issues with other things. Unfortunately I dont have any error messages, just screenshots (there were no error messages produced).
Also, I am having issues with the nUI pet feed thingie. i got an error from the pet icon, and when i clicked on it it didn't give me any food option, and yes I do have food in my bags.