usually solo mining with cgminer works just fine but this miner doesnt even start when i append -a groestl to it...anyone even got gpu-mining with the wallet to work with the provided gpu-miner?
Umm... -a groestl is for CPU minerd, it won't work with sgminer. See
https://bitcointalk.org/index.php?topic=475795.0 for GroestlCoin command line options.