If I remove the dll from the plugins folder, the toaster will pop up to recognize that it's been removed. If I then put it back, the toaster will inform me that it's been scanned and one new plugin has been found. But it just won't appear in my menu.
This is exactly like the problem I had with the Venom 303 synth on my last rig, in that the scanner would recognize it and scan it, but it would not show up in my instrument list. This I put down to something screwy on my old rig. But this is a brand new rig, brand new installation of everything, and I'm seeing the same problem again.