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Though it might be a little bit late, but i just come across the same problem today when install and run RapidMiner Studio in a brand new Mac. Here are 2 points :
1. Instal Java 8 / Upgreade the Java to Java 8.
2.Restart the mac
3.Run RapidMiner Studio, go to menu, click "View"-"Restore Default View", then suddeenly everything showup.