I tried to copy my site to a new sever and since id did that, I get an HTTP-Fehler 500 (Internal Server Error): on certain pages. The log files are reporting:
PHP Fatal error: Call to undefined function chdir() in /var/customers/webs/something/includes/bootstrap.inc on line 3384 PHP Fatal error: Call to undefined function max() in /var/customers/webs/something/includes/lock.inc on line 106
I cleared all caches many times with:
drush cc all
and also flushed the cache tables directly with MySQL commands. I disabled APC. I don't think, that this is a problem with the server, because it serves well for other Durpal sites.