Install fails with /dev/mapper/live-rw does not exist

[Alex Regan]

Hi,
Trying to do an f22 Live Workstation install on my new Toshiba P50 
laptop and the install fails with:

[  187.874987] localhost dracut-initqueue[471]: Warning: Could not boot.
[  187.891048] localhost systemd[1]: Received SIGRTMIN+20 from PID 472 
(plymouthd).
[  187.893397] localhost dracut-initqueue[471]: Warning: 
/dev/disk/by-label/Fedora-Live-WS-x86_64-22-3 does not exist
[  187.893565] localhost dracut-initqueue[471]: Warning: 
/dev/mapper/live-rw does not exist
[  187.897504] localhost systemd[1]: Starting Dracut Emergency Shell...

So, it boots off the DVD, so it's not a problem with the drive. I've 
also tried various boot options including pci=nomsi,nommconf and 
libata.dma=1 without success.

I've included the rdsoreport.txt output here:

http://pastebin.com/BrqeMY4w

Perhaps someone can take a look for any ideas?

Thanks,
Alex