Are you using Debian? Debian doesn't use the session GC in PHP - instead, it cleans sessions in a cronjob. To enable PHP GC in Roundcube, one
must
add (to main.inc.php) these lines:
Wonder why the maintainer did that. Sounds pretty weird.
Quoting from the Debian php.ini file:
; This is disabled in the Debian packages, due to the strict permissions ; on /var/lib/php5. Instead of setting this here, see the cronjob at ; /etc/cron.d/php5, which uses the session.gc_maxlifetime setting below ;session.gc_probability = 0
Ondrej
List info: http://lists.roundcube.net/dev/