Jamie, thanks for the response.
I tried that and no luck either. This is just baffling to me. It's such a simple thing that I have always done and now it's not working. Here are the differences from my previous implementations:
1. Using Dreamweaver CC 2015 instead of DW CS6
2. Using WebAssist Suite which generates MySQLi instead of MySQL, so the generated PHP is different.
Otherwise, I think it's the same - the database is a copy of one I had used for dev purposes, so nothing changed there, and the db and website are on the same server as all the other sites (my dedicated server at a web hosting company), so versions of MySQL and PHP are the same.
Any help would be greatly appreciated.