Second Life version 3.6.2.279258 OS X 10.8.4, iMac w/2 GB RAM, 2.4 GHz Intel COre 2 Duo, ATI Radeon HD 2600 Pro 256 MB The Viewer launches and operates flawlessly for a random period of time, anywhere from 5 minutes to over an hour. At some point, it abruptly becomes non-responsive, and the spinning beach ball of death appears. However, the audio chat continues to function! I can hear others talking, hear streaming music, and if I have my mic turned on, I can continue to talk to other people. But the interface completely freezes. I don't see text chat (although I can hear the "beeps" telling me chats are appearing), I don't see the environment updating or people moving. I can't interact with the Viewer; it ignores both the mouse and the keyboard. The only way I can exit is to Force Quit. And, the funniest part, is that even after I do Force Quit successfully from the Viewer, the audio chat continues to function! The only thing I have noticed in way of causality is that I switch back and forth between SL and my web browser (usually Firefox), and that the freezes seem to coincide with switching from browsing to SL. Mahalo!