I have the same problem but wit minertopia pool, you can see the post: https://bitcointalk.org/index.php?topic=1896605.msg23970707#msg23970707
Is like the coins are sending to other wallet and never get my wallet.

Right now, pool.minertopia.org is down.

Now, I am mining in zpool but yet they don't send my anything, I have to wait 2 hours. I 'll advice you if I receive the coins in my wallet.