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Have you tried to use SeekAlignedToLastTick(TimeSpan offset) in code? Did it synchronously set the correct position?

I'm not saying this would be the final answer, but it would be useful for me...

When I read Msdn, it tells me that a timer is used when the story board is started and then the timer is stopped when board.Stop() is called.

In terms of your problem, it could be that the timer...

You should read up on Storyboard in msdn and try some different properties and methods to get the behavior you are looking for.

Try calling SeekAlignedToLastTick(TimeSpan offset) either right before or right after you call Stop();