The new beta version of the editor broke the Validator (at least on Chrome). The error is:
Uncaught TypeError: Cannot read property 'length' of null
WME_Validator.user.js:129
Uncaught TypeError: Cannot read property 'length' of null
WME_Validator.user.js:129
Re: [Script] WME Validator 1.1.16 / 29.01.2016