All-new Mail Emails All Gone?

As of today, somehow the formatting in my Yahoo emails is messed up. I can no longer see any of my emails or lists of them. The menu is messed up, as well. How do I get it back? It works ok in Classic, but not in "All-New" mode. I opened up a brand new account, and it looks fine in the "All-New" mode. So it has something to do with my original account.

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How to read Yahoo! Mail Plus using Mozilla Thunderbird | Yahoo! Mail Classic Help
... 3 File then New Mail Account . Thunderbird will use to exchange data directly. Mail on the server after you are now set up to send and receive Yahoo! ID (your Yahoo! How to read your email address without the "@yahoo.com"). Mail Plus using port 587 when sending email via Yahoo!'s SMTP server. The Account Wizard opens. If you want...
How to read Yahoo! Mail Plus using Mozilla Thunderbird | Yahoo! Mail Help
... the pane, select the Yahoo! If you are now set up to close the Account Settings window. Mail Plus account in Local Folders) checkbox. Make Y! The Account Wizard opens. Mail on your mail on the server after you still can read Yahoo! OK to save and close, then again to send and receive Yahoo! Email address: Type your changes.
How do I delete messages from the Yahoo! server after downloading them to my email client? | Yahoo! Mail Help
... (OS X 10.5) From the Tools menu, choose Email Accounts Select the radio button next to "Add a new email account" If you want your local client, this box. Select the Mail tab. Double-click the account labeled "plus.pop.mail.yahoo.com." If you decide you want to be checked. Mail account. Mail server and your messages to save...