Hey @domocon,
We’re so sorry that updating Roon resulted in this… 
It looks like you’ve been thoroughly investigating this and you’ve found the resources that should have helped. We have posted this to explain in more detail why this happened:
Starting fresh should allow you to use Roon 
. Would you please try to:
- uninstall Roon
- restart your HP
- download Roon
- install it fresh and launch it
Does it work?