I had a similar problem with my ME Super. I would wind the advance lever, the film would advance but the shutter would not cock.
It would do this for four or five frames and then finally catch. On my camera I discovered that a rubber bumper inside the camera had decomposed into a sticky mess and appeared to be causing my problems. I cleaned it up and got it working again. I really need to replace the bad rubber part because now 3 or 4 years later it is starting to do the same thing again, no surprise there since i didn't actually replace the bad part with a new one. lol. Anyway here is a picture with a pointer showing the problem spot on my camera. I will warn you that taking apart one of these cameras is not for the faint of heart. I enjoy doing this kind of work so it was not a big deal for me, but I have no good way to tell if someone else will have trouble with it or not.
Removing the leatherette is quite easy. Just pry up a corner and start pulling.
It is just stuck on with contact cement. I used Pliobond to stick it back on when I was done. You will have to desolder some connections to get the camera fully torn down. And some of the connections don't leave you much room to work with!