Thanks for the response!

I know ~13 MHash is low, but one of my GPU miners is making steady progress and reporting only ~8 MHash.  I'm not trying to compete here, just trying to figure out why this isn't working and looking for any insight on this.  If any of the shares were accepted, I wouldn't worry as much about the electricity cost, but since it appears everything is rejected, it looks like a completely fruitless venture.  I'd really like to know why though since my non-CPU miners are chugging along properly (albeit slowly as well).

My first guess is that it's some kind of configuration issue with cgminer, but it appears to be working properly and connecting to the right miner site with my proper username/password.  I just can't imagine a miner can be computing at that rate for this long and not have a single accepted share, or any indication of what's going wrong.