Hi @Katun ----- Thank you for the report and sharing your feedback with us.
DSD512 is definitely being supported by Roon so something else must be going on here. Was this once working for you as expected?
As others have mentioned in this thread, the ability to playback DSD 512 will be dependent on what gear you are working with. If you can provide a brief but accurate description of your current setup, using this link as a guide we can advise.
Thanks!
-Eric