php require and autoload

I use __autoload to load classes, and I keep getting errors that no class is found but file get's loaded ok. Then if I change something in a fi开发者_如何转开发le, just something like add a new line and save it, everything works fine and class is then found. But this is a great problem cause there are thousands of files in this project and I don't want to change them one by one. I'm using php 5.3.0 on windows.

What could be the problem?

I found that the problem is only with php version 5.3.0 and corresponding php_apc.dll