I have had problems with crashing with 1.20 RC2, RC3, and RC4. (RC4 was just released last night.) THIS IS *NOT* A DUPLICATE!!! The exact steps I follow: 1. Uninstall any currently-installed RC software. 2. Download and install the Release Candidate. 3. When asked by the installer if I would like to run Second Life, choose "Yes". 3a. Viewer runs. Be amazed at how neat it all looks. 3b. Quit Second Life RC viewer. 4. Wait a few moments, then try to run the RC viewer. A gray box appears with the text "Loading Second Life..." centered inside. 5. Watch in frustration as the viewer crashes and the Crash Logger tries (and, hopefully, succeeds) to send information to the necessary server. 6. Scream. My current OS version has SP1, but I only installed that (and updated various drivers) in an attempt to make sure that outdated drivers were not the cause of the problem. Current drivers have been in place since RC2, after it wouldn't run.