[bobbyh]

Chris, I did disable plugins, but I hadn’t wrapped the Email Notifications plugin function call with a function_exists wrapper, so my active theme stopped working when I did so. I then oh-so-intelligently reasoned that this plugin couldn’t be the cause of the problem, so I moved on…

I couldn’t just disable all plugins and test with a default theme because of the existence of private forums. Finally, I moved the database to a private test server (and used a HOST file) and went through all the plugins carefully one-by-one until the problem was fixed.

Let my idiocy be a lesson for others: wrap your plugin function calls with function_exists wrapper!