Ok, finally, after several different tries I finally set the options on VST to "rescan" but left the reset option "unticked". Both Celemony and V-Vocal showed up as an option for Region FX. But, here's the thing, all the VST's that were available as a Region FX previously, disappeared. These included, but not limited to "perfect space", "TH2, the full version", and several others. Go figure. I guess I really only needed melodyne as a region FX anyway so I'm mostly happy. By the way, congrats to Cakewalk for truly amazing and useful products in Sonar X, if I had to take just one DAW to a desert island this would be the one.