Yea, everyone is having that problem (including myself).
EU went down, then US went down, now asia went down. I'm sure devs are fixing it. Regardless, mobile wallet should be coming out soon.
Also it could be a pending payment as well. I know for me, I mined 10 minutes after it hit the blockchain. Though I closed it after an hr and started mining again. I didn;t get my payment until 1-2 hrs ago