andyjh,
can you tell us if you have either a Nuendo 5.x.x or a Cubase 6.5.x license present on your dongle?
If not, then the mysteryriddle really goes on…hehe.
CU
The same problem here, on C 6.0.7 on Win7 x64, installed both versions, doesn’t show up in neither of them. I tried even a reboot…