[ Also reported at http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=687447 ]
I am using Debian Stable (Squeeze). When upgraded to the version in Debian Testing, currently 1.4.23~svn20120406-1, one user reported that she is missing the INBOX link in the folder tree. This user has the largest list of subscribed folders on our server (390 folders). If I reduce the list to 10 entries the INBOX link is shown.
I have tried adding and removing the entry "INBOX" from the list of subscribed folders but to no avail.
I have also tested upstream 1.4.23 SVN snapshot of 2012-09-12 with no success. The behavior is the same as with the version from testing.
The folder tree appears correctly with the SVN development snapshot of 2012-09-12 (so version 1.5.2), though this was tested with a fresh
http://squirrelmail.org/wiki/KnownBugs suggests to change the respective setting "11. Tweaks" with conf.pl. Apparently, this is true only for 1.5.1, or at least I could not find anything in the list of Tweaks.
System: Debian Squeeze, Apache 2.2.16, libapache2-mod-php5 5.3.3, courier-imap 4.8.0