I need to pay closer attention. Did the difficulty raise again? MY stats on YPool has dropped like a rock on sse11 from dga.
Check your miners - some people are reporting that they're seeing invalid shares start showing up after the miner has been running for a long time. I haven't been able to replicate this yet on any of my machines, but I'm looking.
yupe, 3 in a row after you mentioned it.
4 hrs after I started 2 instances of xptminer on 2 different machines, I noticed a chain of "Reason: CheckProofOfWork() : n not prime" on my I7 4770, compiled to AVX. My other machine, Quad core Q9550, compiled to SSE, no chain of msg yet.