I'm trouble shooting a rig that is giving me problems and my next step is to cpu fold. My last configuration was gpu only and when I start the client now without GPU installed I get the error message and no way to edit my prefs over to cpu. Do I actually have to install a gpu, change prefs to cpu fold and shut down, remove gpu and hope prefs let me cpu fold on restart? I'm thinking there must be an easier edit to prefs.