I've been having the same problem. Also, when I drag an audio file to a midi track, for a brief second you see Cakewalk applying ARA then nothing. When I do Region FX, it starts to work and for a second Melodyne pops up at the bottom of the window, then disappears. I read the suggestion about uninstall/re-install of Melodyn, but how do I do that? I can go to Windows Control Panel and uninstall Melodyne, but how do I re-install without re-installing all of X3? I don't recall seeing a Melodyne only install.