ZOOM R16 & Cubase 7

My R16 which works perfectly with Cubase 5 on windows XP and windows 7 32 bit, as well as windows 8 64 bit, refuses to work with Cubase 7 both in 32 bit, 64 bit under Windows 7 and Windows 8.
Mackie control works fine, latest zoom drivers loaded fine following full removal of previous drivers.
Zoom ASIO driver apears in “device setup” and “VST connections”
I have tried uninstalling and re-installing Cubase but cannot get any audio input/output!
Anyone got any ideas?