[Dovecot] not showing subfolders on INBOX

[David Benfell]

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Hi all,

Apologies if a duplicate message. I initially sent the following from
a non-subscribed email address (my usual address, but not the one that
works when I'm having trouble with mail).

First, I'm pretty sure I screwed up something with dovecot. The
symptom appears in both thunderbird and mutt.

I'm moving my server from a VPS to a dedicated server. *Both* are Arch
Linux systems. Here's the dovecot -n output:

# 2.1.15: /etc/dovecot/dovecot.conf
# OS: Linux 3.8.4-1-ARCH x86_64
base_dir = /var/run/dovecot/
default_client_limit = 3000
default_process_limit = 1000
login_trusted_networks = 10.8.0.0/16 127.0.0.0/8
mail_location = maildir:~/Maildir
mail_max_userip_connections = 30
passdb {
  args = failure_show_msg=yes
  driver = pam
}
service auth {
  unix_listener /var/spool/postfix/private/auth {
    mode = 0666
  }
}
ssl_cert = </home/www/ssl/www.cybernude.org_publickey-apache.pem
ssl_key = </home/www/ssl/www.cybernude.org_privatekey.pem
userdb {
  driver = passwd
}

One detail, the kernel version, is different from what is indicated
above. munich is the new system; atlanta is the old one:

Linux munich.parts-unknown.org 3.8.4-1-ARCH #1 SMP PREEMPT Wed Mar 20
22:10:25 CET 2013 x86_64 GNU/Linux

Linux atlanta.parts-unknown.org 3.6.10-1-ARCH #1 SMP PREEMPT Tue Dec
11 09:40:17 CET 2012 x86_64 GNU/Linux

I literally copied this configuration, so it's the same on both
systems. But on the new system, I'm not seeing subfolders in INBOX. I
also copied my Maildir from the old system to the new system, so it
should--I thought, anyway--be okay.

What did I do wrong? And how should I fix it?

Thanks!
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