Osx Compatable With Xinet Server


i am working on a G5 using CS suite 1 running on a Xinet fullpress server flashnet 5.7.07. I am experiencing a load of problems ie illustrator, photoshop and quark are continualy crashing every half hour or so with a "inexplicably quit" message. Is there anything you could advise me on to rectify this problem. Cheers