Hey Ironhead, I have the same problem with the "Super Stopper" anti-reverse on my Corsair. If there is tension on the line (fish) and you release the handle, sometimes it doesn't catch, and starts paying out line, handle turning to the rear. Did it once on the hookset, also. UGLY! Design flaw? Sounds like it may occur in other Shimano reels also. Thanks, but I'll stick to my Ambassadeurs.
Greg