Updated to 4.0.1 Pro and now I have the welcome page but clicking on any of the tabs will send me to a blank screen. Console shows:
Uncaught ReferenceError: addonsJSON is not defined
at 8665 (5bf1c4e758731473eb0373dcac161191.js:8:44353)
at a (5bf1c4e758731473eb0373dcac161191.js:8:262415)
at 5bf1c4e758731473eb0373dcac161191.js:8:264006
at a.O (5bf1c4e758731473eb0373dcac161191.js:8:262689)
at 5bf1c4e758731473eb0373dcac161191.js:8:264019
at 5bf1c4e758731473eb0373dcac161191.js:8:264025