After this commit: github commit opencl platfrom selecting logic changed. Try to set "gpu-platform" : "1" in conf file. You can use this exe: https://www.dropbox.com/s/fjtmzlq3o623mql/vectorAddition_exe.zip  (virustotal) for check list of your platforms and devices. It's trimmed version of my opencl program for experiments. Sources, you can compile them by yourself, if don't trust me.
You may need vc++ 2010 redistributable to run it: http://www.microsoft.com/en-us/download/details.aspx?id=5555