Severe graphic issues with nameplate active.

Hello, I have been playing since AA with no problems at all. But since two days (before the maj), I am experiencing an issue in game with the nameplate on :

http://imageshack.us/photo/my-images/10/oyq2.png/

If I turn off nameplate in the settings the bug is completly gone, except that if I alt+tab on windows and go back on game it often displays severe graphic bugs:

http://imageshack.us/photo/my-images/19/vbi4.png/

And this can go off if I alt+tab multiple times and finally the game is fine again.
So basically, this bug came from nowhere, I was playing just fine for a week with 0 bugs, I alt+tab and come back and this happens. I did not touch anything anywhere.
I've tried to do everything I could think of, I obviously restarted my pc, reinstalled the game, updated my graphic drivers.
But I do not know what to do to fix this, other games are working just fine (WoW, LoL, SC2 exct...).
So I need some help :)

Same thing happened to me. Tried 2 different graphics cards: GTS 450, GTX 650 TI. Both give me the same error. As OP stated, game ran fine for a week, then RANDOMLY this happened when I opened the game. I have tried virtually everything in the graphics settings no only in the game, but also in my NVIDIA control panel and this issue still persists. There are many other forums with others having this issue and so far no solutions other than to turn nameplates to only when targeted/off. This is not a card error, but a game error.