I'm trying out Joomla 1.7 on my Perfect Ubuntu server w ispconfig3.
When I try to add an item to the main menu, the screen idles and then goes blank. Googling the problem I found another used who found in the ispconfig logs
PHP Warning: readdir() expects parameter 1 to be resource, boolean given
So did I. His fix was to change the site's PHP settings from FasCGI to suPHP.
That made no difference when I tried changing it on my site.
NOTE: all the other sites on server are FastCGI, and all work perfect with Joomla1.5