The task list is shown as empty in Roundcube but the Tasks folder is there and has several messages (corresponding to the tasks). The tasks can also be synced without a problem via iRony. But Roundcube fails to display any of them.
The /var/log/roundcubemail/errors.log shows the message:
DB Error: [1146] Table 'roundcube.tasklists' doesn't exist (SQL Query: INSERT INTO tasklists (user_id, name, color, showalarms) VALUES ('1', 'Default', '000000', '0')) in /usr/share/roundcubemail/program/lib/Roundcube/rcube_db.php on line 568 (GET /webmail/5YxtSRLg3tn9Qf1W/?_task=tasks)
It is not clear to me if this was caused by a (recent) upgrade, but the task list was working fine some months ago.
pykolab 0.8.23-0~kolab1 all
roundcubemail 1:1.5.3-1~kolab2 all