I would continue to follow the thread about this error in the Mentor's forum. The developer server just pushed a huge new feature a week ago (custom character sheets). Whenever the Devs pass new code onto the developer's server, things are very liable to break because we're actively testing new content. It's why it starts on the developer's server and not on the main server. Part of the perks of being a mentor is being able to test and play with features before they're available on the main server and give feedback directly to the Devs. If you need stability, it's best to run a game on the main server and wait for features to get tested and later transferred over to Main.
