When does the daily payout happen?
Usually 02:30 UTC, 2.30 AM UTC.
But today's payout is delayed due to h2o having to do some manual adjustments. He posted a while back about it:
The payout tonight might be late. No more than an hour or two though, if at all. I need to manually move balances from unexchanged to exchanged.
For ref:
http://middlecoin.com/faq.html