Hi Frank,
I did as advised by Tamas and Jude.
I applied all notes that can be implemented as indicated in Pre and Post Implementation Checklist and at last the last mandatory note 2050325 which contains a list of notes to implement.
Our Screen Personas started to work after applying the 9th note (2100681) of note 2050325. We now get to see the "P" icon and the editor.
Still have to implement the last 10 notes from note 2050325 but seems to be working. For the last note in this bundle you need kernel patch level 101 which you already have.
Best regards,
Laura