Could it be that "set new-folder-format same-as-inbox" documented in <http://www.washington.edu/imap/documentation/imaprc.txt.html> does not work in imap-2004c1? I have done a bunch of tests with this and it seems to have no effect when the INBOX is in mbx format.
It works for me. I just tried it. Note that an mbx-format INBOX must exist in order for this to work.
set disable-plaintext nil
"nil" is not a valid argument.
-- Mark --
http://staff.washington.edu/mrc Science does not emerge from voting, party politics, or public debate. Si vis pacem, para bellum.