Hi Duncan,
Repair Permissions didn't help. (I'm calmed down a little, though!) When I open Quark, I get the splash screen. Fine. When it gets to the point in loading where our name would appear under "Licensed To," that's when it quits. I looked in the Quark App folder and package for a preference file or anything with today as the modified date, but I couldn't find anything. Is there somewhere else, System Folder or something, that would have that? I heard that OSX doesn't use preference files, but then I thought someone said it does but in a different way? I'm still no good at troubleshooting in OSX. I'll look around some more and may have to contact Quark. At least they don't charge anymore, but I haven't had to use it yet... They're probably all in India...