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I managed to find a solution. All I do is instead of running the RuneMate.jar file inside the Application's Package Contents I just run the .jar...
I don't see how the fact that we're running 64 bit should be a problem. That is, unless the runemate client has been built specifically for a 32...
I'm also having this problem! I tried running the jar from terminal, which works, but is java version 1.9. It worked but I was unable to attach to...