Miningpools.tk has been unable to get pool to start working I get found blocks but same errors as prev posts. I will keep trying to get it working. If anyone else figures it out please post here.
One of the other pool operators has a lead on the problem which I've passed along to the dev. I'll also post it here in case it tells you anything, ob1100:
I don't see any 'lazy' references in the source tree -- so someone was very careful in source creation.
This error is related to the submitblock function in rpcmining.cpp 503-527
I wish my C skills were a little more refined... but my best guess is that the submitted block cannot be matched up with the last mined block.