Hi Hanz,
I’m very sorry for the long delay in answering this issue. If I understand you correctly, you mean that sometimes when you start your application, the button is gaze-aware, and other times the button never react to gaze?
Which version of the Tobii Engine are you running?
I made a small application with the code you provided, and could unfortunately not reproduce what you describe. If you approve we could discuss your issue via email.
Kind regards,
Eddie