I had mentioned this in the main release notes thread last night, but I'll agree with simplysup. It looks like the refresh trick worked perfect.
The map itself would show on the screen but the loading box would not go away, caches would not appear and clicking any permium checkboxes made no change.
After I hit the refresh button the map loaded perfectly and I'm able to drag and alter the results with no problems. Great catch simplysup.
BTW I'm on XP Pro SP3 and using FF 3.5.7.