Mutt 1.5.18 + Sidebar - Hangs when reading certain folders

[erik_hahn@xxxxxx]

Hi there. 

I'm a mutt user for a few days, using Mutt 1.5.18 with the
sidebar patch (patch-1.5.18.sidebar.20080611.txt). There are some
mailboxes (maildir format) I can't access with the patched version -
mutt hangs when I try to read them, this is what it says in the status
bar all the time:
        
        Reading .maildir/gentoo/gentoo-dev... 20/57 (35%)

Mutt has 100% CPU usage all the time and doesn't react on keystrokes.

It doesn't matter if I use the sidebar to open the mailbox or not.
Vanilla Mutt works perfectly though.

I suspect there's somthing about one more of the messages in these
mailboxes but couldn't track down anything specific.

        -Erik