sgminer doesn't support Gridseed
You can use bfgminer on gridseeds. At least bfgminer is actively maintained with scrypt support.
I was just replying to your comment that everybody should switch from cgminer to sgminer - that's valid for
GPUs only.
bfgminer has scaleability issues on Windows. Can't run more than a couple of instances, can't run more than ~20 miners. But that's another story, it's not a problem with nicehash.