The "Return to inbox" button does not work after sending a message.  No LOADING indicator icon appears in lower left of page.  I have to use the Inbox  button in the left side menu to return to e-mails. This is in Firefox browser running XP.  What's the problem

This is happening with mail coming in from my earthlink mail account with winmail.dat attachments. .  The paperclip attachment indicator is visible at the folder level, but cannot be found in the email when it is opened.   I experienced a similar problem with Outlook Express.