Is something wrong with the keycoin blockchain and/or client?
Blockchain explorer shows that almost all of the last several hundreds of blocks contain only one transaction (+coinbase).
This transaction has the same input and output addresses (somebody is sending coins back to himself, could this be related to PoS?). There are almost no normal transactions.
etc. You can also check older blocks. The overall number of transactions is also very small and it is much much smaller than before (check around block 18000 or something).
Under these circumstances the mixer cannot work efficiently because it cannot "hide" transaction(s) that send coins from wallet to mixer.
It seems that this is not just glitch in blockchain explorer because keycoin client returns the same transactions for each block (getblock API command).