I am in your same situation. I've mined the pool through a nicehash rental contract. Mined for 3 hours straight , which was almost half the time of the round ( 7:40 hours) . OK, I know that it was a long round and that the PPNLS payout system was going to affect the payout , but to receive ZERO , when I contributed that much to the round seems pretty impossible.
I am a beginner BUT I do not like to point fingers. Before writing here I tried to contact Suprnova, 1) via their support webmail form, 2) directly sending an email to the email on their website, 3) sent a message on Twitter, 4) sent a PM via this forum to Ocminer. I waited 4 days and I've received NO RESPONSE , ZERO, NADA.
I may be wrong and what happened might be totally in line with the mining activity. If you look at the stats of the round you can see my worker (pakal) as being the 4th highest contributor in terms of shares. How is it possible that I mined 240,254,387 shared and NOT A SINGLE ONE was accounted as a PPNLS share !?!?!!?
BUT I have received no response at all, and for this reason I feel I HAVE BEEN SCAMMED.
Ocminer may be a respected member of this forum, and Suprnova a legit pool, but until I will receive an explanation of why I have been denied roughly 200$ worth of payout I'd consider Suprnova a SCAM BUSINESS. BEWARE before you engage in any mining activity with Suprnova.
These are the proof of my mining activity taken from the Suprnova Dashboard
http://imgur.com/DhAZ5B8http://imgur.com/52vUyiG You likely mined during an unlucky period. Suprnova didn't find a block while your shares were among the shares being considered for the block reward. The pool's average block time is almost two hours, so it's not unusual to have a round over three hours. I don't think there's any foul play here.