Running with 'sudo ant run' solved the issue. Perhaps this is related to the uucp and lock group issue.
UPDATE:
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.
UPDATE 2:
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?