Try with this one

sgminer --gpu-platform=1 -o stratum+tcp://pool.hashbag.cc:8644 -o -p c=SIGT

you may need to use gpu platform 0,1,2 depending on which openCL platforms you have installed, you can find a list of those in Regedit at LOCAL_MACHINE/Software/Khronos/OpenCL/Vendors

if you look there you should see the amdocl64.dll listed (if you are running a 32 bit miner on a 64 bit platform then you need to look inside HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Khronos\OpenCL\Vendors)

remove the intel one (write down the value that was in there in case you want to restore intel openCL) that's in that folder and reboot your machine and then you should only have the amd platform left and sgminer won't get so confused