trouble with freezing on campaign screen

I got this game yesterday and started playing immediately with no problems. then today I went to play some campaign and in the single player or multiplayer screen it freezes leaving me no option but to force quit. every other game mode seems to work properly except the campaign.... Ughh. does anyone else have this problem?? Thanks. Oh and I guess I should add that I have a brand new Macbook Pro with no additional graphics card or anything like that so Im starting to wonder if maybe thats the problem? Let me know if yall have any suggestions. Thanks

CarKar92 about Tank Battles, v1.0.0