If you haven't been following GhostCoin closely, here's a quick update on the situation:

There was a wallet/blockchain level exploit which allowed people to mine blocks of any value, including blocks of up to 10M coins. (Not on ipoMiner, but on other pools).

The coin developers have now rolled back the blockchain to block 7629, which was before the majority of the exploited blocks occurred, and the coin is now POS-only with no more POW blocks being able to be mined.

We mined 17 blocks after the rollback block: 7639, 7669, 7776, 7816, 7838, 7855, 7901, 7958, 7972, 8060, 8088, 8310, 8317, 8342, 8362, 8422, 8425. You may see a negative GHOST balance currently because payouts for those blocks have been removed.

I am now going through the painful process of fully auditing transactions that we sent out vs. what exists on the current blockchain. I'll post an update once that has been completed.