choumbie,
i have managed to fix my shifting problems, are you still getting yours?
if you are, lift the gaiter off and take a look at the horizontal shaft that the gear stick & knob sits on.
does the gear stick and its sleeve at the base move left to right without the whole sprung unit tilting? if it does then it shouldnt!
if it does check the horizontal shaft that the gear stick sits on, and to the left on the horizontal shaft itself there should be a small groove with a circlip in it. if its broken thats what could be causing your difficulties in changing.
took me a while to notice the groove cos there was loads of blackened grease all over it but i have put a new circlip on mine and all the gear changes are as slick as ever! far better than getting VW to do it for 25 quid! :D