On line with Apple – seems as this may be a problem with the upgrade version of FCP5 from earlier.
If you have this problem here’s what they suggest.
1. Go to Boot drive/library/receipts/finalcutpro.pkg
delete Finalcutpro.pkg in that folder
ALSO take the Plugins folder and move to desktop Library/Applicationsupport/final cup pro support/plugins
Repair permissions
Restart
Get FCP5 install disk – and reinstall JUST final cut pro (when you get to options for others Motion etc – uncheck all)
Once you reinstall – just for good luck – repair permissions again
reopen Final Cut 5
The boris folder should be in the effects/generator folder and all sould be well.
BUT – carefully reinstall third party plugins one at a time – I put all of them back in – boris Title 3d disappeared again – pulled them back out – and put back one at a time – if one plug in is not compatible it seems to bring the entire plug in folder down.