Mine locks up, too, especially when I try to navigate around in a thread, such as enlarging photos. I don't have to restart my computer, though, I do have to go to Task Manager and close RCU. Then I can reopen it and start over if I haven't gotten too p-ed off by that time. This can be a little frustrating. BTW, my operating system is Windows 2000 Pro. Never had a problem before the most recent updating of the site.... Dzl