Email input plumbing still clogged. No alerts arriving for many days. Other emails blocked. Even from Yahoo!?

Something is still seriously wrong with Yahoo Email... Out of the blue, the pipe was cut or clogged, and all input ceased. Something is wrong upstream. Measures suggested by Ooops (except erase history and change browser) tried, to no avail. I am convinced the problem is in Yahoo, not in my environment. YAHOO: please try to trace an Alert from Alert to my Inbox, I should be getting News Alerts several times a day.