Issue Apache pagespeed extension 404 errors

[Rostik]

I installed modpagespeed through plesk, without any errors. But when I try to rewrite css or images or js, I get a 404 error for those files. I can see them in the cache folder, but somehow they dont show up on the live sites. I have a shared host media temple account with multiple sites. Their tech support cant figure out this problem either. Any ideas? Thanks