skills thumbnail bugged

I recently played a couple of games where my skills, ss, and recall thumbnails were bugged as to be black. I have no idea how this happened i logged off and it was still there and i tried a couple of different maps all made it still bugged it wasnt a huge deal just letting you guys know that something was going on. apparently my friends who were in all the games didnt have the problem, so its just something to think about.