Ok, scrap that thought - I've just gone through all the schemes and the Edit button is working on all of them.
I take it you've tried refreshing the page - or try CRTL+F5 as that clears your cookies and refreshes.
If that fails, I'm stumped as to why it's not working for you but I would have to say it's not the boards as no-one else is having the same problem - that we know of anyway.😉
Could you possibly screencap the area where the edit button is supposed to be so we can see wht you are seeing, please? It may help us fix it.🙂