Fedora 19 install hangs while installing bootloader

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http://www.linuxquestions.org – Hello All, I am trying to do a clean install of Fedora 19 x86_64 to a disc which has Fedora 17 installed. I alternate between two 500 GB discs for each release. I chose to repeat the fc17 partitioning scheme, 524MB /boot, 442GB /home, 47GB /, and swap. The install goes OK until it reports "installing bootloader", which never ends...or for 30-40 mins, I haven't waited longer before forcing a poweroff. The Fedora 19 iso checksums OK. I see a bug reporting this behaviour, but the fix appears to require much more than ordinary user knowledge, and wasn't explained. Can someone please deta (HowTos)