Able to Send but not to recive

I have been able to send and receive emails with eM Client up until about 10 days ago.

I can still send messages, but I am not able to download the messages from the server. I can access my email on the account using the web-based client. I am using Windows 10 (updated) and the latest version of eM Client. is 9.0. 361 (647eb3)

I have not been able to run diagnostics on both IMAP and SMTP. and both come back OK.

I can see my email on the server also the mail test, but do not return back to me.

Has anyone got any ideas as to what the problem is?