Animation Appear-Hide-Appear sequence

I have dozens of technical presentations developed with Powerpoint 2000. When
imported into Powerpoint 2007, the Appear-Hide-Appear animations have about a
one second delay between "Hide on next mouse click" and "Appear". In ppt 2000
there was no delay. In ppt 2007 there is a delay and this destroys the
effect.
I have tried everything I know and have talked to the first level of
Microsoft Powerpoint technical support and they don't know how to fix this.
The case is still open, but I am just going in a circular dance with them.
I do know how to work-around this by creating many more sequential slides
rather than relying on animations, but this would be very time consuming
re-developing all of my presentations, and it would make all of my
presentations much larger in file size. If there is not a fix, then I would
have to make about 300 CD-R's to send to all of the technical trainers across
North America with the corrected effects.
This has become a nightmare for me. By the end of August, all employees are
required to have made the transition from Office 2000 to Office 2007.
Has anyone had to deal with this issue and discovered the fix?

Dirt