In my experience Vue 4 Pro was very unstable until the release of the 268493 service pack, which seems to have corrected a lot of unstability problems. I'm currently using 272334 & am having very few problems. Open GL turned on, background draw on, Win XP Pro, AMD Athlon XP running at 2 Ghz, 1Gb DDR Ram, and Nvida Gforce FX 5200. I do not do animations and don't have Mover installed, nor have I found it beneficial to turn off my firewall. Of course this is just my own experience, your mileage may vary :o).