I am having the same problem. VST instruments show up no problem, but VST effects, while they show up in my Plugin Manager on the left, they are not available on the right (nothing at all on the right), and not available to place on instruments. It’s as if Cubase recognizes them, but does not let me select them.
I recently re-installed Psychic Modulation’s EchoMelt and Phonec, and the instrument installed fine, and is available, but the effect displays in the manager, but it not available. I am starting to realize this problem only applies to effects, and I actually haven’t been able to install an effect since some point where I must have changed a setting in Windows.
I like to have a tight security system, especially with Windows 10, so I toggle off a lot of the telemetry (for whatever good that does). I am thinking that there is some conflict between my system and Cubase effects.
Any ideas?