System:
AMD Athlon 64 X2 Dual Core 4600+
1536 Mb RAM
Windows XP Professional (5.1, Build 2600)
NVIDIA GeForce 8800 GT 256 MB
Problem:
I upgraded to patch 6, started the program and it froze during loading the arena. Map hadn't completely loaded yet, but the Map background was there, just no bases/spawns. I saw that you suggested to turn off compatibility mode, so I did that. A little later, I had the following occur. Didn't make the game unplayable, just a visual bug from what I've seen.
