Cubase 8.5.15 and Reason 8.3.2

Hi! New here at but I have worked with Cubase since 1990s.

Now to my problem, when I try to start Reason 8.3.2 via Rewire on Cubase 8.5.15 it don’t work.
Reason says “Please check your host” and it will not start.
When I start Cubase and go to devices and start rewire Reason I will get the box where I can start Main L & R and the other 64 channels.

Help please, I have been in contact with both Propellerhead and Steinberg but they blame on each other…

Imac 27" late 2013 8 Gb RAM EL Captain (latest update)
Audio interface Propellerhead Balance