Any fix for FCP 4 "unexpectedly quit"?

[YangZone at aol.com]

FCP 4.1.1 will no longer load on my 1GB 10.3.2 TiBook. Before it makes it to the desktop the error "unexpectedly quit" arrives. 
After running Disk Warrior 3, Cocktail and Disk Utility with no luck I deleted everything Com-F can find on FCP (prefs in both Libraries etc), emptied the Trash, restarted and re-installed and updated everything. I even tried swiitching users. No joy.

The (new) installation runs when I boot from an external Volume and this is OK for now but I would prefer to run the OS from the TiBook and to keep the media external.

I would like to avoid a clean OS reinstall but this looks like the option I face... unless...
any ideas?

PJ