Hey ZaRR, this issue sometimes happens when the application loads while you're focused on another window.
Please make sure you start the app, maybe click on it once, and wait for it to finish loading before you switch to another window :)
Hey hackerysk, unfortunately I could not find the sources of the project, however this is where I found how to make the window transparent:
https://answers.unity.com/questions/869378/viewing-desktop-in-scene.html
https://forum.unity.com/threads/solved-windows-transparent-window-with-opaque-co...
I am a professional with a few years of experience, I work as a Gameplay programmer for Amplitude Studios!
https://store.steampowered.com/developer/AmplitudeStudios