I'm also got this error. Always with different file name. Today i just tried to do the Burning Temple event, but could'nt because crashed all the time after like 1 min.
I sent a ticket about this, but looks like they know ****.
I checkd the drivers, they were up to date. Updated the vga driver, didn't worked.
Direct X was up to date. I reinstalled the whole game, didn't worked. (Yes im always using ccleaner, also defrag, also spybot....)
Every other games works, only AvA has issues again, after the january update.
Edit: The file names for me are different tho, it's not the hud, but the map names, weapons names, ... *.upk... But again, the reinstall didn't workin