Are you guys using any special command line ?
Just the miner deployed by 1GH with keccak algo defined, that's all.
git clone https://github.com/1gh/cpuminer
cd cpuminer
./configure CFLAGS="-O3"
make
strip minerd
./minerd -a keccak -o stratum+tcp://maxpool.1gh.com:17333 -u walletaddress -p x