version- and am currently trying to upgrade to devel-version.
Dont do that or you will most likely break your setup! The Dev 2.3.1 version is older then the 2.2.10 release, it is from another branch and the dev releases should not be used in production enviroments. You can not downgrade to the stable branch anymore!
To fix your problem with the left window, check the title field of the isp_nodes table for unusual chars or maybe a linebreak.
You will find several posts in the forum explaining the database structure.