Hey! Tom . . . you're (almost) a bleeding-edger
FWIW - several months ago, after "some one or another" update to 10.5, I believe, my 24" iMac/Intel went absolutely k-r-a-z-y. Its video flashed with several rapidly-changing, anomalous hues and the display looked like a 1937 Saturday afternoon western (you DO remember, don't you?) when the film's sproket holes tore and the frames zipped by at 120.674 mph?
The Genius to whom I was assigned at the Burlingame store is the guy commonly regarded as the pick-o-the-litter . . .
by the other store employees. He worked for more than one hour (@ 99.528 mph), and then in a kind of Oh Oh Moment (I thought) looked the "Other" row in Syst Prefs.
Bingo! Then, saying "Oh no!" he trashed
Application Enhancer and that did it. Instantly.
He was quite critical of it, asserting that I probably didn't need it for anything, anymore. Apparently it got carried along as I went from earlier editions of OS X.
Not a cough in a carload, since that moment.
In case you're interested, I'd let it be, as they say.