Yes, there was some problem, which is already solved. Originally pool paid out 100 people every hour in one single sendmany transaction. But with recent boom of userbase, 100 slots was not enough, so some payments (usually those 0.01 BTC) were pending for longer time. Now I increased payout slots from 100 to 150 and set up processing payouts every half of hour. Currently all payouts are processed and I'll be watching if 300 payouts per hour will be enough...