YouTube Sidebar displays videos on a per post basis. To make good use of a single space it allows ads to be displayed when no video present
Browse the changes log and decide if an update is required. There is nothing wrong with skipping version if it does not help you - look for security related changes or new features that could really benefit you. If you do not see any you may want to avoid updating. If you decide to apply the new version - do so after you have backedup your entire WordPress installation (files and data). Files only or data only is not a suitable backup. Every WordPress installation is different and creates a different environment for WTG Task Manager - possibly an environment that triggers faults with the new version of this software. This is common in software development and it is why we need to make preparations that allow reversal of major changes to our website.