Firstly, I had to trash my FCP prefs, and I did it by the book.
Went to use the luma key (fx flug) for an effect in my FCP 6.02.
It is now not appearing in the Key section (only a non fx-plug
luma key appears.
Fortunately I had this effect in the timeline prior to trash, so I stole
it back and put it in the faves.
Very odd to lose an fxplug, isn't it?