Unix hosting

My pal (pal by ICQ ;-) broken mind about simple problem...

Pre...

On localhost all work nice. Stable and fine. (Windows)

After uploading to unix hosting my pal get some troubles with error "Model not found", "Controller not found" etc...

But, of couse, file posts_controller.php, post.php are present in bot copies of site.

Decision: unix-style hosting known file Post.php and file post.php - it's really different file. Not same. 

So, if both copies of your site identical - don't forget to check filename uppercase & lowcase ;-)