@Brudertac - Thanks for getting back. So far I haven't seen a confirmed case demonstrating that it has worked before, so if you would be able to help us with that, it would be great.
For this, I would need to have logs from the current version and the previous version showing the exact same playback situation (same file, same client, same settings, etc.)
With regards to rolling back: It works in many cases when the versions are not too far off, but sometimes it causes problems and you'll need to re-create the library database.
Best is to do a backup of all data folders before downgrading.
And of course: First, create the logs with the current version before downgrading.