Everyone who experience issues - would you please provide an OSX version number you use? Remember, that this build requires version 10.7+.
Also, make sure you delete ~/Library/Application Support/OpenXcom before trying new build.
And most importantly - try only vanilla Xcom data, don't put any mods there, because they might bring their own incompatibility issues.
Oh, and one more thing - make sure you don't have any YAML libraries (especially those of previous versions) installed somewhere in the system. 'brew uninstall' or Macports uninstall or whatever any instances of those to have a clean experiment.