Server unreachable.

Server unreachable.

When clicking "Reply", in the old version (which I much prefer to the new one) I get "Loading" - which disappears after a few seconds with nothing happening.
In the new version I can compose a reply, but upon sending I get "Unable to reach the server.  Please check your network connections."  But my network is doing fine otherwise.
This has been the case for some 12 hours now, I'd guess.

(BTW, when switching between old and new versions, I often end up on the Russian site "mail.ru".  Any idea how that could be possible?  I never see that site or anything like it in any other context.)