There's a delay with Cryptsy withdrawals just like it was yesterday (after which was resolved a huge payout was sent). These coins are already exchanged into BTC so we don't risk currency rate changing, but they're pending withdrawal. As far as I know, other pools are affected as well. It's Sunday so I'm not sure how fast it will be resolved, but I believe there's nothing to worry about.
Does this mean the pool is only using 1 exchange? I moved some rigs here from MC a few days ago and I like what you have done here but you should probably develop a few more trading options, especially if you expect the pool to continue growing. Besides helping to insulate from deposit /withdrawal issues, you will probably find the added book depth helpful.
totally agree on this. it would be good to eliminate single points of failure where possible, and putting all the exchange in one basket seems like a bad concentration of risk. i've had good experience with vircurex.