Yes I’m using the Tobii Core SDK, I checked in the project settings for the destination framework and it is .Net Framework 4.5 .
In the afternoon I’m gonna reproduce my project and put it on github. Thank for your help. Since the problem is happening in an installed-version and I don’t have way to debug it I also put in my code some message boxes that show me that the Host status is connected. It seems that the gaze aware routed event, instead, isn’t called until I press the window key and turn back to the app. It works just pressing the window key, not minimizing and then refocusing the window.