Thanks for the advice. Thats the exact thing I was doing. Coming from latest official Cyanogenmod, to the latest unofficial.
So I did exactly what you said, tried to install, it failed, rebooted straight from recovery back into recovery, and I indeed had clockworkmod 18.104.22.168.
So I did the install again, it worked, installed the minimal gapps, but I did not format the SD card. I figured I would try without it first.
Well upon booting I couldn't get past the first screen of the setup wizard, it would just crash. Had a very difficult time getting back into recovery mode, as the typical 3 button combo wouldnt work, but finally figured out a way by sheer luck and experimentation (hold volume down, and power, and plug in a usb cord. Keep the buttons held for about 30 seconds, then release the power button while still holding volume down, after 10 seconds it would go to recovery)
So I did the format of the internal SD card as well, but no luck, the wizard still crashes. Ended up just restoring my old nandroid. I wonder if there was anything else you did different than me. Perhaps different Gapps?