[imp] Seeing Inbox(1/12) -> There are no messages in this mailbox

[Harlan Stenn]

I have a FreeBSD site where I've freshly installed:

Horde: 3.3.9
Imp: H3 (4.3.8) (run Imp tests)
Ingo: H3 (1.2.4) (run Ingo tests)
Kronolith: H3 (2.3.4) (run Kronolith tests)
Mimp: H3 (1.1.3)
Mnemo: H3 (2.2.3)
Nag: H3 (2.3.5)
Trean: 1.0-cvs (run Trean tests)
Turba: H3 (2.3.4) (run Turba tests)

PHP Version: 5.3.3

I log in and see I have a folder with 1 new/unread message, and 
expanding the "Mail" button I see that it's the Inbox, with (1/12).  I 
click on this folder and see:

  Inbox (1)        No Messages
  There are no messages in this mailbox.

If I "visit" this account with Thunderbird, I can see the messages.

Horde and Imp tests run fine.

I see no error messages in any of the log files (apache, dovecot, ...)

Suggestions?

Harlan