It seems just removing Support_Updater fixed my version problem.
The popup no longer comes up on launch.
Somebody should probably tell Greek2Me if he doesn't already know
Thanks Paperwork
Edit: I'm also getting word that any theme editing addon that edits the server menu will either not work, or break something on the menu.
Blockland Essentials apparently removes host names from server titles.
Just a heads up on that one.