Welcome to the Microsoft Edge Insiders community

zipswich 

Yes, this is the right place.

There's a few things bothering me in your note.  If I have it right, you are say the Edge we have now, that your'e calling "Classic" quit working, in so much that it suddenly would not load Twitter so you 'switched'* to Edge C. And, now, suddenly, today that won't open, either.  What did you use to write this note, here in the forum?  Edge, Edge C, the same computer or a different one?  There may be something deeper afoot, but, for now... can you please try removing Edge C, Dev or Canary, whichever you have, then go https://www.microsoftedgeinsider.com/en-us/download & download it & re-install it.  Report back on the behavior after that is done, please & thank you.

*We can run Edge C, as well as Edge, right now, not instead of Edge.  Testing right now not, replacing, yet.

If your issue with Edge is more than just Twitter... Right now, Edge & Edge C run in or on a machine in very different ways.  Edge is part of the OS, Edge C is not. And if your Edge is not working (right, you may need to do a Reset on your machine.  But, see what happens after you R&R Edge C.  That's the easiest 1st step.

Cheers,
Drew

Edge (Chromium) is not starting for me either after the latest update. :S

I click the icon on the taskbar and even tried searching for it in the start menu and launching from there, but none of them open and the process is not even running in Task Manager.