[Zope] Zope and Tomcat troubles

Hi, Since I installed Zope on my server Tomcat has stoped working, and I was wondering if any of you knew of a solution. When I try to load the management interface for TomCat, all I get is a blank page, the same when I try to log into OpenXchange... I installed zope from the Plone Suse 10 rpm bundle on a Suse 10 box. I hope this isn't too much off topic, but I'm quite sure Zope related. Thanks in advance, Mads Munch Hansen