Okay, so if I'm reading this right, the FS Open executable has no problems loading FS Open data, but when instructed to try and load TBP, it crashes? If you still have the archive you downloaded with TBP in it, ask your archive program (I use 7-zip, see the bottom of
this page for info on downloading it.) to do a CRC check ("test") on the file. If you are not sure how to do this, get 7-zip for Mac OS X and open the archive in that. Then, simply click the "test" button. If it comes up broken, or 7-zip refuses to load the file, you probably need to download it again.