Paul Wax

I always wanted to get KSP since I've heard and read so many good things about it, but since I purchased the Apple version KSP via Steam for my iMAC, I've tried many times to play KSP but even after several re-installs it keeps on hanging up and crashing after the initial load (I do see the "Monkey General" Logo and all the files being loaded) and after I get to the Main Menu I select START NEW GAME and TRAINING (any tutorial within TRAINING) and/or START GAME from the menu provided. Once I select either, I get a cursor arrow which changes into a spinning colored wheel on a black screen with only the "LOADING" icon in the lower right hand corner. Nothing else happens and I wind up "Force Quitting" the game. Can someone out there give me some advice/instructions on what I need to do to get KSP to work? I am very frustrated and disappointed with the current status of KSP on my iMAC.