Mousetrap: Just wait 20-30 seconds and hit reload on the browser page. It does happen to me (not very often - at most 1-2 times a day) - but like someone else said, it seems to be when Fencer is on - and last time I seen him looking at the bug tracker right before I could not access the site for about 10-20 seconds..... like he was fixing the bug and took a short down time while the fix went in would be my guess.