Today's Rawhide 12 appears to have problems.
1. LVMs confuse it - had to use a rescue CD to set up a simple partition table .
2. Can't mount an ext4 root
3. Bad repo on x86_64
Workaround: set simple partitions with fdisk on a rescue CD. Install the i386 flavor. Use one partition for swap, one for ext3 root. The rest of the fresh install was uneventful.