The Beta channel has been updated to 51.0.2704.55 (Platform version: 8172.39.0) for all Chrome OS devices except the Acer Chromebook R11 and the AOpen Chromebox Commercial. This build contains a number of bug fixes, security updates, and feature enhancements.
If you find new issues, please let us know by visiting our forum or filing a bug. Interested in switching channels? Find out how. You can submit feedback using ‘Report an issue...’ in the Chrome menu (3 vertical dots in the upper right corner of the browser) or by pressing Alt+Shift+I.