I'm also unable to duplicate the problem. The focus mode works just fine for me when I tap it first thing after opening the camera. It must be a compatibility issue with another app, or even the kernel you've chosen. I know it might sound weird that the kernel is the issue, but I just discovered last night that it was the P3Droid kernel I was using that was causing Goggles to force close (same result with Slayher kernels, but ChevyNo1 kernels don't cause the problem).
To troubleshoot my Goggles problem, I did a nandroid backup of my setup, wiped my partitions and loaded the naked stock ROM, then added nothing but wifi and Goggles -- Goggles worked. I then added just my theme -- Goggles worked. I then added the P3Droid kernel I was using and Goggles immediately FC'd when I tried to open it. Next I loaded a ChevyNo1 kernel and Goggles worked. I loaded P3Droid and then Chevy again to verify the result. When I tried the new Slayher kernels later in the evening, Goggles FC'd again. Maybe you could troubleshoot your issue in a similar fashion.