Thanks!
Could you please share your seminar config? I am apparently doing something wrong...
.\sgminer\sgminer.exe -k groestlcoin -o stratum+tcp://dmdpool.digsys.bg:3333 -u *** -p *** --intensity 20 -g 2 --thread-concurrency 8192 -w 256 --difficulty-multiplier 0.0039062500