FedUp F19->F20 fails after reboot

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http://forums.fedoraforum.org – I'm trying to upgrade my F19 using FedUp. FedUp completes nicely, produces a looong log that as far as I can grep, doesn't contain any warnings or errors. One repo (flash) failed to update, but that shouldn't be a problem. After I reboot, GRUB correctly gives an option to upgrade, which I selected. Boot-related info runs on the screen for a few seconds. It looks a bit different from my normal boot sequence, so I guess all is well. When the actual upgrade process should start, it reboots again. Now the upgrade entry in GRUB is gone, so it'll just boot to F19. -I've tried this several times. - (HowTos)