I've downloaded from master like one week ago, and when I follow this tutorial, and finally click on "Visualization -> Transparent mode", the program crashes with the message:
Exception: null
Exception: null
It's so bad I can't even close the program (I had to restart the computer, since I couldn't find it in top). This happens with or without using my GPU (NVIDIA 830M + Intel Core i7) and even inside a Virtual Machine (Virtual Box) with a cleaner installation of Arch Linux. I use OpenJDK Java 1.8.0.
Let me know if you need any more logs.