Hey Mark!
Sounds like the settings of the Launcher got somehow changed. Hold the Shift or Alt key on the station's keyboard while our Launcher starts. You can easily restart the Launcher via the SpringboardVR icon found in your tray icon area (bottom right in the Windows taskbar, probably hidden behind an arrow pointing up) - right-click the tray icon and click on "Restart Launcher", then make sure to hold Shift or Alt.
A configuration window will pop up that allows you to set the resolution!