Hi Fellow Hunters,
Is there an easy/quick way to backup and only transfer the Personal buttons and settings to another PC, which already has Directory Opus installed (don't want to reinstall DO as it is not my PC but they would like my buttons). 
Thanks for any help
Yes. Go into the "customize" mode & drag the buttons in question into a folder (resulting in .dcf files),
then, in the other PC´s Opus (also in customize mode) drag them into a toolbar.
I had similar probs using DO also on tablet, but with different settings. Another solution is creating usercommands for own buttons and just copy them from prefs folder to the other. This will prevent collecting them from toolbar again next time and you have them saved even when you remove one from toolbar. I have lots of commands saved which I actually do not use, but maybe later. Therefore usercommands are perfect.
Thank you both for helping