A platform behavior controlled sprite won't behave properly with vertically moving platforms (solid behavior). You will get stuck in the platform while moving upwards and be constantly falling while moving downwards, rendering you unable to jump for most of the time.
Was just mentioned in another thread yesterday and I recalled that I ran into the same problem too a while ago. Came up with a nasty but acceptable workaround, but I'd rather have this working properly of course.
Here's a link to a demonstrational capx:
Platform glitch example