Got the 430EX from UPS today. AutoZoom seemed to be working as I read through the manual. But now the LED screen reads:
ETTL M Zoom 14 mm
C.Fn settings are all at 0. Tried zoom on my wife's XTi.
Oops--there's the answer...page 18 of the manual under Using the Wide Panel. "Pull Out the Wide Panel..... The ZOOM button will not work.
Wide panel was out just every so slightly.
Leaving the topic up for the next person who has the problem.