I got the error 2013-09-17_163148 after attempting change my game's resolution and from windowed to full screen. While I can play the game fully, I'm unable to access anything on the bottom of the screen (including friend's list when I was trying to add a friend to play a game with him).

Running on Windows 8
Processor:Intel(R) Core(TM) i7-2600K CPU @ 3.40 GHz
RAM: 8.00GB
64-bit Operating system
NVIDIA GeForce GTX 660 Ti