Well, on a Mac, you select the app. icon, chose get info, and then are able to alot how much memory the particular app can have. Once I needed to alot over 350 megs of virtual memory to render an animation in Poser. You can check it out at my experimental web site bullmoose.50megs.com.Maybe PS is chewing up a lot of memory, so that your system loses out and can't keep the cursor on screen.Like I said, I am on a iMac and only trying to put my 2cents in and help out. If I were you I would ask around the other forums maybe, since this seems more like, a system problem, from my standpoint. Good Luck! Span(;>