Скачать или смотреть Reaper DAW trying to run SampleTank 4

Odd situation. Reaper Daw is up and running and a vst Piano is opened. It plays fine with on screen virtual keyboard and my Keystation Midi keyboard.
I open an instance of SampleTank 4 which i purchased and registered.
Very, Very ODD. SampleTank will load instruments and play using the on screen virtual keyboard. BUT NOT the Keystation Midi keyboard.
I have tried every combination of settings with reaper and still nothing at all.
What am I missing. In fact I even loaded and empty track and ran Sampletank as an fx on that track. Same results. On screen keyboard works. Keystation does not. (piano still playing with Keystation.)
Challenge goes out. Kenny or anybody, got any solutions?
Thanks to all. hope this gets some traction!