Can you post sample batch file for GPU miner
Fresh 64-bit Windows miners with stratum fixes:
For GPU miner pass -t X option where X is a number of GPUs. GPU miner has to be executed from the directory where kernel directory is located.
I do not have a batch file but a command like this should work:
minerd-gpu.exe -o stratum+tcp://rlt.blockquarry.com:3039 -u pinwc4.1 -p x -t 1 -i 22
That was running on a 280X at about 1.4MH/s. It looks like you can adjust the intensity settings with the -i flag. Also with -t do not set it to 2 if you do not have that many GPU's, you will get bad shares (boooo) submitted like nonce had mentioned.
I see now looks like -t for gpus is still number of threads, but still related to number of gpus my bad

edit: this also fixes the duplicate shares for us for now, using -t 1 so that info may help with the fix
edit2: ok that still only uses 1 gpu