Is there such a thing as a GM glitch?

[The Skirata Clan]

To my limited knowledge, there is no such thing. However, the reported cases of "inside deleting" ( thats how I call it), as occurred by "bad" officers that were mad with their GM. The best advice is this demote everyone until everything can be considered safe and promote those that are in the highest of trust, delete such member from the guild and friend lists, and talk to your members about such topics just to warn them of the situation with such member. That is how I would handle such things. That is the best advice that I can give you. Good luck with you guild.