Selecting an origin while the multiconnect mod is enabled causes the screen to become the "dirt screen of death," i.e., the dirt texture loading screen. This loading screen never transitions to the game until you press ESC, but after doing so, you won't get the origin you selected. Getting rid of multiconnect makes the select screen transition to the game just fine, and readding it after selecting an origin while you didn't have it enabled doesn't seem to cause any further conflicts with Origins in that world, but still breaks the select screen in other new worlds.