As in my previous post (http://www.howtoforge.com/forums/showthread.php?t=44590) I have once again managed to break ISPConfig such that it cannot find various files. It occurs on any tab and comes up with (eg, on the sites tab) "Warning: listform::require_once(list/web_domain.list.php) [function.listform-require-once]: failed to open stream: No such file or directory in /usr/local/ispconfig/interface/lib/classes/listform.inc.php on line 51" followed by a matching fatal error. I've now discovered that the problems occur when I specify an include_path in /etc/php.ini To prevent the problem, it is neccessary to have "." in the path list. For example I originally set include_path = "/home/extras/inc" ISPConfig did not work. However if I set include_path = ".:/home/extras/inc" ISPConfig works again!