Posting this on the forums as I'm told that's the best way to reach the author, Justin Shannon
When clicking the fullscreen icon (just next to minimize), vATIS will normally compress into a smaller, more compact view, with only the ATIS letter, time, and an option to go back to the main view.
When I click this button, the vATIS compact window takes up the entirety of my left monitor with the ATIS letter, time, and an option to go back, leaving a lot of empty dark grey on the screen. It always appears on the left monitor, regardless of which monitor the main window was on. I have tried reinstalling the application with the same result.
Potentially linked to this issue, when going back to the main view from the broken compact view, the border and top buttons disappear. The top buttons re-appear when mousing over them.