FL Studio.
I re-run the plugin scanner, and it showed error on the Valhalla Room and d16 Group's Lush-101 plugins.
I un-installed and re-installed them, but the same story...!
I tested with VSTHost app, and these ...
forum letting ya ll know, that some keys are working in the VST instrument mode of FL Studio
-Numpad
-CTRL -key ( with mouse, but not with X,C,Z Shift+Z etc )
and some other keys work in the VST i mode ...
forum