Just thought I'd report back. I just installed OS X Mavericks and, like everyone else, needed to reinstall a Java SDK. I installed the Java SE Development Kit 7u45 from the link that OS X sent me to (http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html), the one for Mac OS X x64. My streambaby is working just fine. Please note, though, that I have the fix / edit applied in my streambaby.bat as follows: java -Djava.net.preferIPv4Stack=true -Xmx256m -jar "$DIRNAME/jbin/streambaby.jar All of that may or may not be needed (per recent posts) but that's what I'm using and it works for me, so until someone fixes streambaby itself... Happy Mavericks-streambabying!