[QUOTE=Draspur] I wasn't using physics for them, simply X - 3 every tick[/QUOTE]
You should check out the manual entry for Delta time ('dt')..
but anyway, have you tried doing the same thing to the player as to the platform?
when the player is on the platform, You can also have player X -3 every tick.
(but read about dt before you do that)
Tried that but its not very smooth, delta time causes the same problem...