OS X update borks Steam on Nvidian Macs

Valve, the company behind game distribution system Steam, has warned that Mac users should avoid upgrading their operating systems to 10.6.4 if they have an Nvidia graphics card. Valve is currently working with Apple and Nvidia on the problem, and a fix is imminent, apparently, but we have found that upgrading to the latest version of the Apple operating system causes severe malfunctions in even slightly older games like Half-Life 2. In our experience some games...