Does someone know the cause of this?

hi We used xscreensaver on previous SuSE versions with no problem. Now we have 7.1 PRO and when a user runs xscreensaver it works, but when he tries to exit KDE it doesn't quit regularly so the user has to hit ctrl + alt + backspace. I read its man-pages and faq both local and their website to no avail. All xscreensaver settings look fine, but I still believe it has something to do with security. Because I tested it with root and that can exit KDE regularly. The funny thing is if the user kills xscreensaver pid the whole KDE desktop exits instantly. This's home workstation and we need X running most of the time since we never use Windows. Any solution to this problem or a place to find it will be appreciated. thanks