Issues with episodes 1 and 2 of The Walking Dead

The Walking Dead was running smoothly on my macbook pro until I downloaded episode 4. Now when I play episode 1 I can't use the escape key sometimes, the game freezes for several seconds (usually about 5-15 seconds) when it tries to save. After completing episode 1 I try to start up episode 2 which will ask me if I want to rewind my game despite the fact that I never played it. Regardless of whether I click yes or no the game stays on a black screen and the only thing I can see is my mouse arrow (which I can still move). So far the only way I have found to get out of the game from that point is to shut my computer down.
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