I had the same problem with latest LL viewer version. I tried everything: restoring computer to earlier date, uninstalling and re-installing SL,etc. Nothing worked and couldn't even send a crash report. I solved my problem by installing Phoenix viewer. I love it! It works great, screen is less cluttered, and it is more user friendly. It took me only a day to get used to the different format. In short, the latest LL viewer is not good. A friend had to uninstall the LL viewer also and use the Phoenix viewer instead because he saw nothing but black. I couldn't even log on, crashing every time. Forget about messing with Linden Labs viewer and install a different viewer. I understand there is also one by Dolphin, but Phoenix is good.