I'm trying to figure out this issue. I have moving platform, that move fast, but not too fast. You can notice the player moving up and down, but slightly offset, almost like he's going to fly off, or slip off.
dl.dropbox.com/u/32409323/Examples/Engine.cap
You'll need this.
dl.dropbox.com/u/32409323/Examples/Color%20Replace.fx
I can fix it by giving the player sprite a platform behavior and set everything to 0.