Oh, yeah, missing info.
I had switched mapvote.smx out for mapvote_extended.smx since it had some nice features. like not binding to the 1-3 keys, and giving you a heads up when the vote's about to start.
But it also had a cool feature of crashing the server.
so back to mapvote.smx
edit: Added up-front payments as well, for those who prefer that method.