Craft 2 JS error in CMS since upgrade to 2.7.0 My Control Panel has stopped working since upgrading to Craft v2.7.0. in chrome. I get the following JS error no matter what is clicked in the entry fields and no action is taken. So for example if I want to remove and image and click the minus button nothing happens. If I try and add Matrix fields nothing happens. All of these were working prior to the update.


  Uncaught TypeError: Cannot read property 'length' of null
      at n.constructor.getWorkingTaskInfo (cp.js:863)
      at n.constructor.setTaskInfo (cp.js:832)


I'm running on PHP 7.0.13 any ideas?
Try reinstalling Craft. I believe there was another report from a user that had similar JS errors. Try replacing the core Craft files in craft/app and see if that helps.

Craft 2.7.1 was also recently released.