[Zope] Mac crash with ZMI!!

Hello, I've a big problem! Several mac-user have reporting problem on my site realized with zope-cmf. So, i've decided to verify it! It's true! I've used a mac with MacOs 9 and Microsoft Explorer (the last versione available). When i open the home page ....in the middle of operation ...mac crash (all is blocked)! I can only restart. At this point, after restart, i call ZMI .....i insert the login...pwd......and...schioccccc...all is blocked another time!! ON ZMI!! With Netscape in the same mac all is ok. I have tried this in other two mac with same result. I've used for my site Zope 2.5.1 and cmf 1.2 Max