Thanks for the reply.
Unfortunately, we cannot get to the point to connecting a database.
The screen displays blank with an error, not the screen with the list of the folders that need permissions changed to proceed from there.
An "index.html" in the same folder displays just fine; "index.php" throws up the error screen.
FYI - we have dozens of websites on the same server, and recently installed a Moodle site there also, so the server is working just fine.
The Revive Adserver is the only script that is being uncooperative.
After reading you link in detail, we DO have an AD BLOCKER running.
We will experiment by turning that off to see if we can get the proper result.