Application Loader Problem

Erised

Hi. I uploaded my iPhone and iPad versions of my game without any real problems, but now I am trying to upload my Mac version and it is not working. I get all the way through the publish process without a problem, but when I load up Application Loader, it does not seem to recognize that there is a valid binary file. I zipped it up before using Application Loader, just like I did for the other versions, but the zip file is greyed out.