The nicehash site is back up.
However, my "non-login" account does not reflect the previous balance in the "old balance" tab.
It displays "Old balance 0.00025380 BTC" for all non-login type accounts under the "Find Miner" tab..
So does this mean they are only going to reimburse those that mined to their log-in type accounts...

I had 0.01576199BTC when it went down..