Hi @Graeme_Harrison ---- Thank you for the post and sharing your feedback with us. The insight is greatly appreciated!
Moving forward, I agree with @wizardofoz in terms of needing some more details here regarding the issue itself and your setup. With this in mind may I very kindly ask you to please provide me with the following:
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Has analysis completed on your library?
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Any issues playing audio from the iMac outside of Roon? You mentioned that you have Bluesound devices. Can you play to the endpoints without issue via the BS app?
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Please expand on your setup description using this link as a guide.
-Eric