Just to update on server issue:
It seems we have fixed it, but we will monitor till tomorrow to be sure.
It was related to updating miner credits balance with CPU mining, we have temporary removed code to be sure this was the reason, once we are sure, we will make required modifications and add it back. Meanwhile users will need to refresh their Boost page to know how much credits they have.

Sorry about yesterday server lags, we think it should not happen any more.