I have read a few posts on this and my car crunches on changing from 1st to second. It happens if you change gear quickly. If you change slowly it is fine. My car has 48K on the clock. I have a warranty with the car, took it back and 2 x "mechanics" said they couldn't get the gears to crunch and it was me changing gear to quickly and not allowing "time" for the hydraulic clutch to work.
Are they fobbing me off? They have said they will put a new gearbox in if I want but I am worried I or rather they may make a minor (and often non existant) problem many times worse once they get their hands on fitting a new gearbox. I have another year on the warranty so I am thinking of leaving it to see, but my argument carries more weight if I dont leave it.