Michael,
We're investigating another report of something similar. It appears to be that AJAX requests can mess with some of our detection for the 'current' page, used when logging in and out. For now, we'd recommend setting the Returning User Redirection and Logout Redirection to a specific menu item instead of leaving the user on the current page.
We hope to have a solution soon to the problem, but changing those settings should fix you for now.
Thanks, and sorry for the inconvenience,
Alex