I need to update the animation synching, but I cannot edit them

I have one slide that I would like to add a few more animations to...but I've already synched, and saved and closed, on that slide. Now when I go back into Synch Animations, when I click Start Synch, the progress view briefly shows "Animations remaining=5" which is correctly updated (there were just 3 animations ) but then it disappears and won't proceed. 

Am I hopelessly stuck with three?

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