HI Ulf,
I’ll send you two files. One before selecting Pianoteq 6 as an instrument and one after selecting it.
Cubase Pro 9.0.2: Even though Pianoteq 6 (VST Version 3.6.7) is listed under the VST Instruments in the Plug In Manager, it doesn’t appear in the list of VST instruments for either Track or Rack selection.
I’m on 10.12.6.