Some people on the forums have informed us of a couple of issues, two examples are Monks Quest Issue - Unresponsive Oakfield Abbot and Co-op can WIPE your character experience, gold and abilities. In both topics a member of the development team posted a reply that's helpful if you're experiencing both issues.
As KaleidoscopeMan puts it; "We have been looking over the forums for problems that we can fix and will do our best... Hopefully everyone can forgive us for the occasional problem that you guys have found. We fixed over 65,000 bugs on the game (it's so massively huge and complicated) that it's unfortunately inevitable some will slip through - after all, I guess everyone plays the game differently. We'll keep you posted."