I'm beta testing Melodyne ARA in Reaper 5.93pre5. Sometimes when I start a new REAPER project and open Melodyne, the non-ARA Melodyne (with the Transfer button) opens instead of Melodyne ARA.
Once the non-ARA Melodyne is opened, I cannot remove it from the project. Removing an instance of the non-ARA Melodyne or deleting a track with the non-ARA Melodyne results in a REAPER crash.
Also, I only try to open the VST3 version of Melodyne. VST2 is not an option anymore.