I tried installing Fedora 9 Alpha from the publicly provided DVD. The installation went fine with the default partitioning. Then I tried a new partition scheme with various partitions and only /home encrypted, that worked fine too. When I tried a new partition scheme, having swap, root and home encrypted, I got the error in the screen shot attached. The error occurs at the end of installation, while "Installing bootloader". Sorry if I could not copy the full bug report on the GTK window, but the test install was run inside a VirtualBox machine, and I could not find a way to copy, so I had to screen shot the tty.
Created attachment 294349 [details] grubyDiskName error in the console
An addition, here is the full partition scheme: /dev/sda1 = /boot 100MB /dev/sda2 = / 5G /dev/sda3 = swap 1G /dev/sda5 = /home 2G
The problem is triggered by the use of an encrypted regular partition for the root filesystem. This should be fixed in rawhide once booty is rebuilt.