Zoom regions not functioning

I'm having a related problem (similar to Tom's), except my zoom starts two seconds into the slide and abuts another zoom. My zooms are set to very slow and both last at least 4.5 seconds (which should be plenty of time to complete the zoom at that speed). In preview, the initial zoom doesn't zoom in all of the way, and then it finally jumps in when it starts to pan over to the other zoom region. Then the other zoom region doesn't fully come into view before the timeline ends. I can fix the problem by switching to a faster speed, but I'm trying to simulate more of a pan effect. I see from other posts that people have been requesting improvements to the zoom feature, as well as bug fixes. Any word on the status of these fix and improvement requests yet?