Not all mailboxes listed when migrating to new server

[kae at midnighthax.com]

To recap: I am migrating a Cyrus IMAP server to new hardware. To
migrate the accounts I did the following on the old server:

ctl_mboxlist -d > /tmp/mailboxes.dump

...and on the server:

/usr/sbin/ctl_mboxlist -u < /tmp/mailboxes.dump
/usr/sbin/cyrreconstruct

(This is a Debian system, so the "reconstruct" command has
been renamed).

Within cyradm, a "lm" lists a number (maybe all) of the shared
mailboxes, but only three folders from two users' mailboxes. There
are 98 users with a total of 2797 folders, so are large number are not
being listed.

Using iampsync, I can successfully copya user's mail data from the
old to the new system, but that user's mailbox is still not listed
with the 'lm' command.

Can anyone shed any light on what is happening here?

Thanks,
Keith

Versions:
Old server:
name       : Cyrus IMAPD
version    : v2.2.10 2004/11/23 17:52:52
vendor     : Project Cyrus
support-url: http://asg.web.cmu.edu/cyrus
os         : FreeBSD
os-version : 4.11-STABLE
environment: Built w/Cyrus SASL 2.1.20
             Running w/Cyrus SASL 2.1.20
             Built w/Sleepycat Software: Berkeley DB 3.3.11: (July 12, 2001)
             Running w/Sleepycat Software: Berkeley DB 3.3.11: (July 12, 2001)
             Built w/OpenSSL 0.9.7d 17 Mar 2004
             Running w/OpenSSL 0.9.7d 17 Mar 2004
             CMU Sieve 2.2
             TCP Wrappers
             mmap = shared
             lock = fcntl
             nonblock = fcntl
             auth = unix
             idle = poll


New server:
name       : Cyrus IMAPD
version    : v2.2.13-Debian-2.2.13-10 2006/11/13 16:17:53
vendor     : Project Cyrus
support-url: http://asg.web.cmu.edu/cyrus
os         : Linux
os-version : 2.6.18-6-686
environment: Built w/Cyrus SASL 2.1.22
             Running w/Cyrus SASL 2.1.22
             Built w/Sleepycat Software: Berkeley DB 4.2.52: (December  3, 2003)
             Running w/Sleepycat Software: Berkeley DB 4.2.52: (December  3, 2003)
             Built w/OpenSSL 0.9.8c 05 Sep 2006
             Running w/OpenSSL 0.9.8c 05 Sep 2006
             CMU Sieve 2.2
             TCP Wrappers
             NET-SNMP
             mmap = shared
             lock = fcntl
             nonblock = fcntl
             idle = poll