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I apologize for my slow response and my lack of familiarity with macs. When I was writing this, I remember the .jar failing to open when clicking on it - the reason I found was there was an exception being thrown because the resources could not be found...simply because I hadn't included the resources directory *facepalm*. Try to run the .jar file from the command line (I'm not sure how that works in macs). If there's an exception being thrown, it'll show up in the console, and we can further debug this. My thought is the process you used did some actual file compression of the resources, resulting in a FileNotFoundException.
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