problem resolved?
I deleted User Cache, System Cache, System Logs, Application Logs, Temp files and Virtual Memory files followed with a restart and the problem was gone.
you can use onyx to do these operations easy:
http://www.versiontracker.com/dyn/moreinfo/macosx/20070
update:// the error is back opening a document saved when the error was present. now I get the error three times upon quiting quark...
update:// tried deleting Xpress Preferences, didn't work, deleted Quark CMS Preferences, didnt work. But then I deleted ALL the Quark Preferences, restarted Quark, updated the profile manager, defined new path for Auxiliary Profile Folder, leaving ALL the profiles ON, then the PROBLEM IS GONE!
update:// Forget it, the error is back...