Exactly what the others said - I thought there was a problem too, but found that removing your foot completly out of the way of the selector during changes seems to clear the problem. As already said its as though your boots wont let it quite get back into the final position ready to change gear.
I've also found after running in and getting the oil changed the whole bike runs a whole lot better. Everything just seems "smoother", and bike seems a lot faster too - not usre if its just me or if they have actually done anything during the first service.
Hope that helps.
Cheers,
JC
