DisplayLink Manager diagnostics could include a small alpha-blended overlay test for each connected display. A user would load a transparent PNG, move it across monitors, and export a diagnostic result showing whether alpha blending, color conversion, or scaling differs between the native GPU output and the DisplayLink-connected screen. I prepared a clean reference PNG with https://www.makeimagetransparent.net so the source asset has predictable transparency. Including this check would make it much easier to distinguish a driver or compositor issue from a malformed image asset when troubleshooting docks and multi-monitor layouts.