This build includes more bug fixes. We're due a stable release next, so hopefully the 200th release milestone can be a stable release! To help make sure everything goes smoothly, please test this build thoroughly and report any issues you find to the Bugs forum following all the guidelines. If everything goes well there should be a stable update in the next week or so.
Please note that a bug has been fixed in the latest version of NW.js that prevented exported apps working on Mac OS X. Since NW.js is now distributed separately, please re-download and reinstall the latest NW.js dated 9th March from scirra.com/nwjs to make sure you get the fix.