Did you do an upgrade from FC16 or were you moving from a FC17 beta?
This precludes use of the pre-upgrade and yum option. I'll be doing a complete re-install from scratch.
It also means that I am going to hold off just a little while longer until the fsck tool for btrfs is finalized. If it is done before F18, I'll upgrade then.
I'm currently on F15. I did not go to F16 as I use this laptop for work as well, and really do not want to upgrade it all the time, having to re-install/re-configure for my work's environment all the time. :)