I didn't check the dashboard all day -- so, not sure if I experienced the same problem.  However, I do see the long gap in between blocks during that time frame.  And, also for some reason, I am showing a discrepancy on hash power from my miner interface here and the slush dashboard of about 2% +/-.  (This normally doesn't happen at Slush).

I've had this discrepancy over on Jonny Bravo's site, which is why I've been mining here, Kano. Bitminter, and, until recently ghash.

For example, my miner dashboard says 13.04 Th -- and Slush worker page shows 11.3 Th.  

Any idea on what causes this?