Cannot opt out of PM EMails

I'm getting a bunch of PMs these days from one of my players -- and while I'm happy enough to help this person, it's getting my inbox into a state I cannot tolerate in my email. So I figured I'd unsub.

I cannot in IE or Chrome manage to do so. I'll try again tonight on Firefox to see if I can do it then. Mostly what happens is the Save button doesn't record any visible action. When I reload the PM EMail is set to 'yes'.

I'll disable it for you myself right now, and I'll try to figure out why you can't save.