I have been using Drupal on my personal site (running on Free BSD) for a long time without any issues. I am now working on a project for my school, and I recently installed Drupal 4.6.3 on an Apple XServe running Tiger. After some struggles getting mod_rewrite and .htaccess to work properly, everything seemed to be working fine. Then yesterday the site went down for no apparent reason. Here's the error I'm getting when I try to load the site in a browser:
Warning: main(includes/bootstrap.inc): failed to open stream: Permission denied in /PATH/TO/SITE/index.php on line 12
Warning: main(): Failed opening 'includes/bootstrap.inc' for inclusion (include_path='.:/usr/lib/php') in /PATH/TO/SITE/index.php on line 12
Fatal error: Call to undefined function: drupal_page_header() in /PATH/TO/SITE/index.php on line 13
I searched the forums and the bug reports and found that several other people have dealt with this problem, but after spending two hours with my IT administrator, we still haven't solved the problem. I was working on the site the night before it went down, and I installed a few modules (feedback, contact, site map), but I have since deleted those files via FTP, just in case they were causing the problem. Still no luck.
I am looking for suggestions about ANY possible causes of this error message. What are we missing? What files should I be checking? What server settings might be causing the error?