Hi,
A couple of days ago i upgraded to v1.3.6. Yesterday, after a reboot, i found fail2ban was not running. Turned out it couldn't find /var/www/imscp/gui/public/tools/webmail/logs/errors and therefor failed to start.
So i touched the file, chown'ed to the correct vu user and fail2ban was happy again.
Today i upgraded to v1.3.7 and the same thing happens; there is no errors log file for Roundcube. It is not automatically created on a failed login attempt, so i think the i-MSCP installer should create it?
edit: come to think of it, why does the installer delete an existing log file?