I would if I had any clue to what it is. I just experienced it on an unaltered site so I'm guessing it's not really a problem with the integration.
It did however disappear when I logged out so it could be a cookie problem. You could either ask those who are having the problems to completely remove their cookies, or give them the Logout-link. That's my best tip for the moment.
I will try to investigate further.
