Hi Jiri,
Attually, I was able to solve this issue. The trick is to disable some overlapping function keys in the system settings
This link helped me figure this out.
https://bella-usa.com/support/Tech-SupportMac.htm#F-Keys
“10.6 or later: Navigate to your System Preferences panel and choose “Keyboard”. Within this section choose the “Keyboard Shortcuts” tab. In the left hand column select “Dashboard & Dock”, then uncheck the box next to “Dashboard” on the right. Next, click on “Expose & Spaces” then uncheck the box next to “Expose” on the right. Lastly, click on “Keyboard and Text Input” and uncheck all the boxes to the right.”
Besides that, if you should have a non-qwerty keyboard, you should create select a qwerty one when using with FCP.
The shuttle is now working like a charm 🙂
Cheers,
Hans