Hi @sh4dow
Can you tell us which previous driver version that keeps the aspect ratio on your side?
For further analysis, can you please send us the diagnostic logs of your primary machine. Just open the spacedesk Driver Console -> Diagnostic then click the “Save All Information”.
Can you also tell us what is your secondary machine? Is it Android/iOS/Windows/HTML5? And its current native and custom screen resolution set in the viewer app settings.