After upgrading to Magento 2.1.3 using composer I have lost the ability to edit anything. When I click to edit or create products, CMS pages, attributes etc. it simply doesn't show anything to allow editing.
Everything worked perfectly before the upgrade and I have tried deleting cache & static files as well as compiling, redepolying static content, etc.
Other people also seem to have this issue, see GitHub:
Any help greatly appreciated otherwise I am going to have to do a complete wipe and reinstall.