I ran the "preupgrage" wizard last night and have run into a serious problem upgrading to Fedora 9. I'm a Dual Boot user with Windows XP 64 on drive HD0 and fedora on drive HD1.

 It looked like the process ran correctly but on the reboot I was left at a GRUB prompt. It took me some time to work out how to configure and get the GRUB bootloader corrected.

On starting I'm also discovering some issues with YUM not working correctly, it tells me what packages need updating, but it refuses to start the download process.