Running with 'sudo ant run' solved the issue. Perhaps this is related to the uucp and lock group issue.
After further messing around the sudo solution ends up causing the IDE to look in /root for the library folder, so that's not a good solution. Adding my user to the uucp, tty, and serial groups seems to have done the trick.
SUCCESS! I was able to flash the RangeTest example onto the device, although I only have 1 unit, so can't fully test this. I took a look at the Issues list on GitHub and there's not much to go on. Taylor, do you have a list of specifics things you need done or should we just poke around and add things that we'd like to have in there?