Hi Sairon.
I've got two "CPUMiner started for proof-of-stake" in my debug.log since I installed the CC version yesterday. The time-stamp at the top looks like it might be in UNIX time since it doesn't match mine. So the PoS minting seems to be working.
Does the CPUminer just not use much of the CPU to mine PoS blocks? It's still sitting at 1-3% CPU usage.
Yeah, it's just trying every now and then - computes one hash, checks if it's suitable for a PoS block and then slacks off for a while (half a second). (I've had it running for over 100 days on my server with no coins and it consumed just around 60 hours of CPU time.)