Inbox on chess.com email coming up blank (and it's NOT empty)

Hi -- I logged into my chess.com email and the first thing I was greeted with was this:

I then proceeded to click on my "Inbox" and all that came up on the right hand side was blank.  I knew that I had mail in there, I even sent myself some from another account.  I had gone into this account before (albeit when I was a free member) and it worked fine.  The only thing that works is when I click on the root/top folder titled chess.com.  Then I can see the "Inbox summary" and open those messages.  But it doesn't show the contents of my inbox at all.  Anybody else having probs with this?  I am using Firefox 3.0.3 and Windows XP.  Ideas, anyone?

Possible solutions:

Try using the "Control F5" keys to do a hard refresh on the page and then try opening your email again.

Try clearing out the "private data" in Firefox from the "Tools" drop down menu in Firefox.

Hey -- forgot to mention that I tried that before and no work.  however, I am on a different machine now, and although I still get the "NOT FOUND" error when i first log on, at least I can click on the inbox and all my messages come up.  Good enough for me!  Thanks!