when it comes to PoS coins, cryptsy creates problems with withdrawals.
We had similar problems with BTCD coin. They most likely block withdrawals just to make profit out of stake.

Also, someone mentioned problems with ispace and getting 60% of what he should get.
This is a fact and I have discovered it myself more than a year ago.  0% fees sounds good but, they suck your hashrate like crazy.
I was also getting 50%-60% of what I should earn. coinwarz was correct and when I changed pool I was getting 95%-105% of what coinwarz said.
AVOID ispace !

For the moment, I wanted to buy DEM but I am not doing it unless the problem is solved with withdrawals.