My new (used) iMac displays some interesting behavior I have never seen before. Even though all Energy Saver and Screen Saver preferences (only done to see if it would fix the problem) are disabled, every time the machine goes idle it quits all applications. This has become quit bothersome these last few days as I'm working on two machines at the same time and don't always catch it before it goes idle. It did it with the Tiger installation and now with Snow Leopard it continues. Thoughts?