It's been like that for a while, see my post further down :D
Just go make a coffee/tea by the time you get back you should be
able to move normally, the rubberbanding thing seems to last 2 - 3
mins.
Exact same fenomenon is what I am experiencing when trying to play this. Just like Glenn said it should go away after a few mins...
When I used to try to play this game in CrossOver I experienced a different problem too; strange jerkiness when using mouse or trackpad to pan the camera or move my character side to side while moving forward at the same time - made the game completely unplayable, no question there. Using the direction keys to make the same movements worked fine though... wierdest thing...