MisterBill: it's very seldom but still anoying when it does happen
It's hard to track down something like this and I would assume this is a browser caching problem before Method since it happens very seldom. If you can reproduce the steps for us then we can submit a ticket to the dev team, otherwise it could just be a caching problem with the browser. If you're keeping the browser window open for long stretches at a time try to remember to close and restart the browser once in awhile. Worst case a refresh will correct any caching problems in future.
~C