As title says, the EventHandlerAndInstantiator script on the master client's end goes haywire after (a random chance) of someone leaving. This results in players not being able to use any world triggers, drop portals, switch avatars, new joiners get kicked, and more.

Screenie from log attatched.

Brief overview of the world and triggers used: https://www.youtube.com/watch?v=cDCmlSQyY40