Hi Rick and Ken,
So, I stared at the error message I'd included in my previous posting for more than 10 seconds this time and realized at the 11th second I realized the message was actually trying to say something meaninful, but that I was not paying enough attention to what it was trying to say to me. So I went to the PHP memory settings tab in Plesk and saw that for some reason I'd set the PHP memory for the Moodle installation on /site1 to hog all available memory, meaning that the installation on /site2 (for the other domain) was choking to death. That's why I had no problem going to http://gurq.net when I put a simple index.html in, but did when trying to run the script that couldn't run for lack of resources. I have now set the PHP memory setting tab to Default for both domains and, as if by magic, both work. Hope the dumb thing I did by fiddling at one point with PHP memory setting will help any others reading these words with their issues. So consider the case closed. For the moment that is.... Regards