Here's what has been fixed in this version:
Arduino Mega is now fully supported. Meaning you can use all of its pins, both analog and digital
Known bug causing number "0" to mysteriously disappear from dropdown list has been tracked down and hunted
Additionally, we have been working real hard to get the MacOSX version out soon, and we've done real progress. We have a prototypal version working in one of our iMacs here.
So, hopefully, a MacOSX working version will be released around next week. In the meantime, you know:
Remember you can find Snap4Arduino at http://s4a.cat/snap