Moderator’s note: Split off from here.
I have the same problem but I get the errors directly when I go to File manager. I am running php+suphp+xcache and suphp settings should be correct as it does render the admin pages just fine. I just get a lot of errors before the actual page is rendered. I have also moved the system folder outside webroot and configured those settings properly.
I’ve attached a link to a screenshot of the errors.