I forgot: open the bottom lead of the camera and put some vaseline inside - than it will work like a dream.
BTW: when I first used this camera, I was surprised by the way the winder turnes - I first thought it's something wrong, but this is the Hi-Matic.
And another thing: it hapens often after rewinding the film, that the winder and the shooter feel blocked. Fact is that, after half-winding the film at its end, when you turn the winder back, it might block there and you won't be able to deblock it by depressing the shooter. Try again to wind without forcing at all: even 0.5mm of winding counts. Now you'll be able to depress the shooter, and all will work as regular.