The reinstallation of the app usually helps in such cases. I've suffered with it before and only reinstalling helped me. I noticed that the app doesn't recognize the scope if you add additional parts to improve it. For example, when I added tactical scope leveling tool to my SIGM400, and the scope suddenly disappeared from the app. I did my own research and found on ballachy.com that it sometimes happens after you add anything on your scope. Maybe it's better to use chromebook all the time?