After a software update (purple background on login page, password box no longer plain text) I no longer have Wifi. Trying to log in to the hub and the router was unresponsive. Usually a plain white screen, but on the off occasion I can get the the 'Welcome' page it's extremely slow and clicking anything just locks up the browser.
Have power-cycked the router twice, cleared cache and sued a different browser but it makes no difference. Google Chrome developer console shows the following problems:
Factory reset performed and things appear to be working again, but my password box is back to being a plain text input.
That's because you have reverted to the old "built-in" firmware. Once the new firmware is pushed out, you will be back to the latest version. However, as Mike suggested, the reset may get the new version working properly once it installs.