Yes, please do zip and send me the experiment folder if you can (support@empirisoft is fine if I know it's coming). I'll run it here and see what I can do. There were memory leak issues with large experiments on some systems due, we think, to a file called evideo.ocx. However, we are just wrapping up v2010 this week and have removed this file completely now. It was an essential component of the program but we've re-written the code to be much more efficient and *should* solve these experiment-size oriented issues. But before I make any promises, please let me take a look at what you've got and I'll see if I can run it successfully here--both on XP and 7.