Yeah, since you're running a completely different OS than myself, that definitely shoots it down to just a driver issue (probably ATi's implementation of OpenGL commands). And since NoGooD confirmed that 10.5 was also giving issues, looks like I'll be pushing back to 10.4 on my PC.
I also noticed that it quicksilvers not only the guns, but open med-kits and ammo-kits on racks, and the tank.
10.6 does all of the quicksilver, plus torn textures, and messes up water to either having a solid texture, or making it black. Pretty much breaks the game.
10.5 quicksilvers the guns and items, but not much else.
I also tried disabling OpenGL extensions in W:ET, and that fixed everything, but brought up a new problem. Frame rate. With OpenGL extensions, I'd have 90fps +/-5fps. With OpenGL extensions turned off, I'd have... 5fps on average. So also a game breaker.
Edit: Uninstalled 10.6 ( I reupgraded in vain hope of it fixing it), used a registry cleaner, then installed 10.4 Catalyst. Everything works fine now... though now I wonder how well Borderlands will perform... Ah good, still runs rather well. Which is strange, it used to lag like crazy, yet I haven't updated any hardware yet.
Anyway, 10.4 Catalyst fixes everything.
Edited by SkyeDarkhawk, 21 June 2010 - 12:41 PM.