Running iMac 27 slim with 32GB ram i7 3.5 Mavericks.
Joined a game and got theses, all photo taking was black and did not save any pics.
had to screen grab to be able to report this.
After I quit the game and rejoined same game, all was ok again.
I love WOD and would love to help.
Looks like you got quite a rare occurrence. Almost looks as if the textures weren't being loaded at all.