Hello, I was trying to make Logisim run on Gentoo and after the splash I was getting only an empty window. To fix this, I had to change my java-vm to icedtea-6 (icedtea-7 did NOT work). I'm just putting this here, in case somebody else runs into the same problem. I guess it could also be classified as a bug, but I'm not sure about that, especially since (afaik) there is no Linux source support for Logisim (it could also be just from my environment).
Great software btw, cheers!