Guys, I think one should give it 10 mins or 15 mins before pressing "Restart" button on installer as there is something going on with spotlight syncing and/or kextcache process.

On 3 different powerpc macs (quad to mini), I have lived some sort of loginwindow endless loop and it was fixed if I gave it some time after "Installation Finished" and waited for mds/kextcache/mdworker processes do their jobs.

It shouldn't be needed, I know but I thought I better share this experience.