This bug (#364021 imp4: will not display the "folder tree" for imap folders) is very old. Do you can reproduce it with recent version of imp4? I don't have the issue using Iceweasel 3.5.6.
Regards Mathieu Parent -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org