[Zope] Zope not sending images problem

Hi there, I've installed 2.7.8 on OS X Server and added some Zope product. The problem is that the web page works fine from localhost, but from remote hosts it fails to load some random images. HTML loads quickly and without any problems. What could be wrong? Sometimes some of the images load and sometimes not. Maybe I'm out of free memory or something? Thanks a lot, Aidas