Im not sure how common this bug I was having with Voidwalker is. But the bug I had was not allowing my void to keep any of its spells but it's rank1 taunt.
I was talking to a GM about it a few days ago again after having my void work for a few cast after last patch but then stopped working again think they may have done something with it with the patch. After explaining what had happen he suggested to log off and delete my WTF,WDB,Interface folders in the main WoW folder and to remove any extra extra programs for WoW then to relaunch my game.
After doing what the GM suggested to do my Voidwalker has been working. I hope this can help anyone else out there with the same problem.