Whenever I see any character generate a dialogue box, another box with eight "Error"s is drawn below it. This is ONLY for /say dialogue boxes; emotes and special bubbles ("Fall Back!" etc) are normal. This started happening after I updated my graphics card drivers, oddly enough, but nothing else seems to be affected.
EDIT: Wasn't sure whether or not to put this in Bug Reports. Mods, please move it if necessary.
It's an NVIDIA GeForce 330M with NVIDIA drivers, and an Intel Core i5 processor.
The drivers are written by NVIDIA but distributed by Toshiba (it's a Satellite A665-S6057 laptop).
EDIT: Silly me, didn't even mention the OS. It's Windows 7 x64 Home Edition.
It looks like a specific resource file for the normal word balloon is missing or just not loading. (the little tail down to your character)
It's likely that doing a delete/re-install of the game would fix this since it would force the file to be re-aquired.
If that doesn't work you could also try updating the Toshiba OEM driver with a direct NVidia Driver.
Good call, reinstalling fixed it. Thanks.
Are you running intel graphics?