I checked my recording from Saturday again, and yes "Yuckie Duck" didn't have any opening music at all. Looks like these shorts were hastily edited back during the "Cartoon Cartoons" era. It's disgusting. Also, I noticed there's now a Cartoon Network title card at the end of each short (after the Hanna-Barbera logo) which I never recall seeing at all, aside from watching some of the shorts on youtube (where they looked to be recordings from foreign versions of Cartoon Network). Could it be that like "Garfield" these are international prints of the WAC! shorts???