Ahh, there you are! Welcome back, glad to have you.
You can fold on the CPU if you want, but it's really not worth the electric to run it. If you do decide to fold on CPU, make sure to leave a core free for each GPU you are folding on. Thanks for helping. Not sure if you have been following the F@H project, but after asking for people to help, people answered the call and overwhelmed their servers. What I am getting at is WU's were scarce, now it is getting better. Good to see you return!