New Catalyst Release
The ATI website now has version 6.4 of the Catalyst drivers for Radeon videocards posted. This release fixes issues related to DOOM3, Oblivion, Maya 7, Quake 4 and Dawn of War among other products.
From The Chatty
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Quake 4: The game no longer fails to respond after lying dormant for approximately 10 minutes, followed by switching between the game and notepad.exe. This issue was known to occur when extended desktop was enabled on systems containing an ATI dual display graphic card.
Wow! How do you even stumble upon a bug such as this, let alone recreate it and debug it?!