Cannot Receive Mail in Windows Live Mail but can on the web

This issue just began this morning.  I can send email in my windows live mail program but I cannot receive.  It shows that it is checking email and then "no new email messages".  No error messages, either.  If I sign onto my email account online, there are my emails waiting for me.  I can send a test message to myself but it never arrives.  I can log on immediately and retrieve it on the login.live website.  This is a brand new issue and very perplexing.  All my settings appear correct and unchanged.  And Windows Essentials repair utility does not help.  Any suggestions?