when i try to move my z axis manually in repetier-host or any other host software my z axis motors freeze up. The odd thing is when i have just one motor plugged(either the right or the left) into the board and i move it manually it seems to work fine. I tried re-downloading all my drivers. Im not sure what is left to do. My current EEPROM value for steps per mm on my z axis in the repetier-host is default at 4000, when i change the EEPROM z value for steps per mm to anything less than 2500 both motors work.