Solved

Can't operate account

Since today (May 22nd) I can't do anything with my account on the browser (tried with Chrome and Mozilla and the problem was the same). I can operate the menu on the left, but the central area is dark and can't click anything.

If your account is linked to an email or Facebook clear the cache see if that helps. 

Earlier today. I cleared the cache and the problem remains. However I operate another account on the same computer/browser and it's working. 

Update: Problem solved. There was a thin black bar on top saying "BEGGINER". I hadn't noticed it because the screen was very dark. I clicked on it, appeared a tutorial message and that was that. All functional again.

Update 2: Same problem again. Black bar on centre top saying "begginer". Below header and right from the menu is all dark and unclickable.

I had the exact same problem on android. It started yesterday. I uninstalled and then reinstalled. I even cleared the cache but nothing kept happening.

Opened a new account on my pc and again the same thing in both edge and chome

https://prnt.sc/jlpsu8

All good. Thanks.