BUGS.md
You have to remove C:\Users%Your_UserNname%\AppData\Local\ARDUPILOT-configurator
folder and all its content.
https://www.youtube.com/watch?v=XMoULyiFDp4
Alternatively, on Windows with PowerShell you can use post_install_cleanup.ps1
script that will do the cleaning. (thank you James Cherrill)
you have a crappy video card that doesn't support web-gl by default: goto chrome://flags/#ignore-gpu-blacklist and enable it .