128 Meg of memory is a little light to run Poser, especially P5. I have 768 Meg and run into some memory problems, so I can imagine what 128 would be like. There does seem to be a memory leak in P5, where memory is not released back to the system until P5 terminates. There's some controversy over this as some users don't have this problem. I can usually do a number of renders before the P5 freezes on me. But it will freeze, especially if I'm using all the Firefly options. THe P4 type render seems to use memory better (or maybe it just doesn't need so much). A lot depends on the operating system too. Most people have a lot better luck with an XP or Win2000 NT system than with Win 98, since both of those systems manage memory better. However, both of these are memory intensive themselves, and may even make your renders slower at 128 Meg. Some users have reported some success using a garbage cleaner, but not all. This problem does seem to be system specific. If you're running XP or Win2000 NT, the best thing you can do is get more memory. If you're running a Win98 system, make sure you're running with all the latest updates. One thing that may help is a good defrag of your hard drive. This helps with the memory swap file. Hope this helps.