Thank you for your reply. Sorry, I think I posted in the wrong thread. This was in response to Cyprus' "Nginx Trouble seems to be endless."
Nginx seems to be fine (and fast!). But I am experiencing this on Nginx, not Apache. I tried setting display_errors = true and then display_errors = On in the ISPConfig php.ini options, but I'm still seeing a 500 Server Error if I purposely put in a wrong database name. This of coarse, is not something I would normally run a site with anyways. Thank you for your feedback :-)