Software instruments in Cubase out of tune

All my VST instruments are almost half a note flat. It seems to be a Cubase issue (Windows 10). When I use the midi keyboard on my hardware synts or the standalone version of the software instruments, everything is in tune. Suggestions?

Regards,
Halvardsen

The first thing that comes to mind is a sample rate mismatch between the project and your audio interface.

Thanks, problem solved!