oxygen 25 and Cubase 7

Hi I recently bought cubase 7 but I am having problems with M-Audios Oxygen 25
It works quite happy with steinbergs own instruments ie padshop Prologue etc how ever with 3rd party VST ie Sampletank, Kontakt, etc I’m getting no midi in through the channel. The Oxygen25 is a really popular keyboard surely others must be having this problem?