Used to Work, Now It Doesn't at All

Running OSX Mountain Lion, downloaded the app and worked fine for a few days, until I received the upgrade to 1.2.4, then it won't even open, no matter how many times I click on it. Upgraded today to 1.2.4, and still nothing. It's unfortunate, because I liked the program, but I kind of feel like I wasted $3 at this point.
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