[Dovecot] Namespace, Sieve and upgrading to dovecot 2.0 -- no folder "INBOX/"

[Ben]

I just upgraded from debian squeeze->wheezy. This meant upgrading from 
dovecot 1.2 to 2.1.7 and upgrading to Pigdeonhole sieve. I have dovecot 
configured to use sieve and virtual users (I'll post config below)

Now any message that come in get filtered by sieve, but any messages 
that don't hit any filters gives the error (in the sieve log):
 msgid=<x...@xxx.com>: failed to store into mailbox 'INBOX/': Invalid 
mailbox name

As far as I can tell, Pidgeonhole has hard-coded to the behavior of 
'keep' (that is unfiltered emails) to be:
    fileinto "INBOX/"

However, in my setup "INBOX/" is not a valid folder. "INBOX" is. Is 
there a way to get pidgeonhole sieve to treat 'keep' as fileinto 
"INBOX"? Or do I need to reconfigure my dovecot namespaces? I tried 
playing with them, but everything works right now (sharing, etc) and 
when I changed my prefix on the inbox, etc, it did weird things 
(INBOX.INBOX.FOLDER) instead of (INBOX.Folder).

Suggestions?

Here is, I believe the relevant config info:

dovecot.conf:

namespace {
  inbox = yes
  location =
  prefix =
  separator = /
  type = private
}
namespace {
  list = children
  location = maildir:/Mail/Users/%%n/:INDEX=/Mail/Users/%u/shared/%%u
  prefix = shared/%%u/
  separator = /
  subscriptions = no
  type = shared
}

Thanks,

Ben