Only INBOX message shown, in all the sub-folders. From the Left Pane user able to select any sub folder (sent/draft/junk/other mail box in home directory) only inbox content shown to the users.
Squirrel Mail Version - 1.5.2-20120605_0200-SVN.devel
Web server - Apache/2.2.15
PHP Version - PHP 5.3.3 (cli)
IMAP - Dovecot 2.1.1
OS - Centos 6.2
More over this not happen to all the users. This is happen to randomly to some users.
This happen only in Squirrelmail version 1.5.2-20120605_0200-svn
But I have a version 1.4.23[SVN] in the same server that works fine for me.
Why I prefer to change the version is because of Change Password Plugin,
which is not working in 1.4.23[SVN]
Seems to be bug in right_main.php and other related.