When booting with a vanilla kernel (2.6.17-rc3), e2fsck will whine about / being mounted and query the user if it should ignore this or not. When also using rhgb, you just get the "repair filesystem" mode without any indication what is wrong. Since this prevents booting, it's terribly annoying.
Please upgrade to the latest mkinitrd and rebuild your initrd - does that fix this? 5.0.36 was broken in this regard...
That solved the problem yes. Thanks. :)