Checked all hardware, updated drivers, viewers, new Dell computer as of this spring. I have been crashing for a couple of weeks now but this last week it has been 4 - 5 times an hour, no matter which viewer I use. I am at my wits' end. Today even the crash logger crashed! I have checked my net and that's fine, bypassed router, switched from wifi to hard connection, and literally run through every single thing in user prefs even. I need help... going nuts! Did the open gl thing, and lag spikes, freezes, and crashes have stopped. With respect to maintenance, we are religious about it in our family, and have a number of geeks in the house as well as a family run PC repair business, so thankfully I am confident we were reasonably competent with the hardware tests and maintainence, as well as software and drivers. The open gl was one thing I just never thought to check... but I have SL back!