I’m sorry to hear you are having difficulties here, @George_Seiffert.
To start, as @RBM mentioned, may I kindly ask that you please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
I still have a small grayish circle pulsing on my Roon screen.
Can you please share a screenshot of this? May I also ask that you please share a screenshot of Settings > Library?
Since installing Roon have you tried giving your Core machine a reboot?
Thanks,
Dylan