Navigating IMAP in Mutt

["Keith G. Murphy" <keithmur@mindspring.com>]

I'm using Mutt 1.3.12i on Potato against Cyrus IMAP.  I can browse my
IMAP folders fine using 'c'.  Question is, how can I see the *messages*
in a subfolder once I've navigated to it?  Using TAB to get the message
view only takes me back to the messages in my top INBOX.

I hope this is not too off-topic (or stupid).

TIA.