Other than just admitting that it's a known bug without a known fix, I don't think there's any more I can do. There is absolutely no reason for that bug to happen, especially since it's occurring both rarely and randomly - the only reason would be JavaScript not running when it should. The next time you see it, try resizing your browser, there is code in there so that doing so should fix the problem.
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com