I keep having this problem with the home page of one of my sites. I'll get an "invalid access to memory location" error when trying to access the home page. Every other page on the site, I can get to, just not the home page. The index and most other pages on the site are php. We are running windows 2003 server with a 4.x version of php which I cannot upgrade at this time. I just removed Zend Studio server as I read many places that it can sometimes cause that error. Has anyone else had this happen? Any ideas on how to make sure this doesn't happen again? It has happened more frequently recently. The problem fixes itself usually within a half hour.