not what the OP is talking about no, but try this: stand still in front of a little wall or something, where you cant walk over, and then try jumping over it...huh? I have no trouble jumping. It seems to be fine to me.
Jumping could be more lenient, so to speak. You have to be standing in almost perfect 90 degree angles to actually scale anything.
Also remember that the game doesn't register your actions until you let go of the buttons.