You have to run a app_config.xml file now at the WCG Project, something like this is working for me: It works for either ATI or NVIDIA Cards, adjust to fit your needs, .5 CPU & 8 WCG GPU Wu's works good for me on my 3770k CPU & 7970 GPU's

<app_config>
<app>
<name>hcc1</name>
<gpu_versions>
<gpu_usage>.50</gpu_usage>
<cpu_usage>.125</cpu_usage>
</gpu_versions>
<max_concurrent>8</max_concurrent>
</app>
</app_config>