Changing Specialisations Bugged?

I know there's other topics about this, but I thought I would "green tag" one (abuse my position why not?).

So after having guildmates, friends and other players try to change specialisations in Alchemy, Leatherworking, Blacksmithing and Tailoring it would appear that it's currently impossible to do so.

I've have got them try every possible way of retraining, but to no avail.
GM's say it's working, but it clearly isn't.

Can we get any information as to the situation with retraining?