[Dovecot] INBOX empty after dsync

After hearing so many good things about mdbox, I am testing it. I moved my Maildir to a test box, and did the conversion with dsync which reported no errors and appeared to go fine after I set:

namespace { separator = / inbox = yes }

and changed mail_location=mdbox:~/mdbox

But the problem is that the Inbox now is empty in my imap client. What did I do wrong? I can see the emails are there if I grep for subject lines I know exist in my inbox within ~/mdbox, but in the imap client it is as if inbox is totally empty. All the other folders appear fine in imap client.