I posted this somewhere else too. I am on a Macbook with the latest OS. The game works fine, but...
Finally I succeeded in making it all the way thru the end of the easy level on a locked profile. 11 million plus points.
At the end I had the option of going on to "normal" with my remaining lives and score. I selected yes to that option, saved my game, exited, (made a copy of saved game). When I went to continue the saved game on normal, I was asked if I want to continue the saved game on level 1-1 with my 11 million points. I selected yes, but then the normal level starts with 0 points and 3 lives -- the default -- and overwrites the saved game.
I have put the copy of saved game back in the games folder and it does the same thing. Is this a known bug?