How does your .bat file look like? Maybe the intensity value is too high for your card.
setx GPU_MAX_ALLOC_PERCENT 100
sgminer -k skunkhash -o stratum+tcp://sigt.suprnova.cc:7106 -u (myusernamethatidontwanttoshare.myworker) -p (mypass) -I 16
pause
tired i = 20 / 9 / 14 / 12 . this is not working for me.
tried lowering GPU_MAX_ALLOC_PERCENT to 70.
suprnova shows 0 hashrate. 0 shares.
It looks fine for me. Maybe you should let the pool set the difficulty for you, leave the -I switch.
The other thing is in my mind, is that the pool needs time to process the data, that your miner is sending back. Sometimes it takes 20-30 minutes to see the hash rate in the pool. Maybe you should just wait a little bit more. Does your miner show any errors?