Amount of hard drive space left?
Amount of RAM installed?
At first I thought it was a Quark problem. When doing a mundane action such as changing a word to Italic, Quark 7.5 stalls (pretty color spinning wheel comes up and won't go away) it has to be forced to quit. Now, the same thing happened in Acrobat 7, when I was just moving across the top menu bar to drop down the tools menu. I am running MAC 0S X 10.5 on a MAC Book Pro3 - 2.4 ghz. I've run maintenance and everything looks fine.