Hi @Rob_Kraanen ---- Thank you for the report and sorry for the troubles here. Before I gather some logs from you may I kindly ask you to please provide the details of your current setup as seen here.
I mentioned to Lim in my PM, as a test I took an older MBP (2010 i7) and updated to Sierra few minutes ago and have been able to load Roon on to the device and am currently playing back both local and TIDAL content without issue.
Can provide me any further details in regard to this problem you’ve encountered? I understand from your report that this appears to have occurred after the updated to Sierra, but can you think of anything else that may have occurred in the same time frame that may have had impact on this issue? No detail is too small.
-Eric