With me not being that savvy in these kinds of things, of course I know nothing about what this means. What I do know is that when I switch from windowed to full screen, my HUD gets all messed up. Also, sometimes when I have just started WoW, my HUD and chat box is completely blank and nothing shows up and then I get that bug report. Could anyone tell me what this is? If you need screenshots, tell me and I'll attach them.
Edit: Also, I have also not been able to see my 10 man/single/party button thing near my chat bar nor have I been able to see my party. I also haven't seen my buffs.