Hi Flood Thanks for your quick reply. Win10 version & build? (select Windows 🔎 Search, type winver press enter, the popup will display the information) 1909 (Build 18363.628) KSK license & version ? Premium, 1.0.5.1360 Has a KSK/system requirements check been done? yes Is “after entering the password & pressing enter, the screen goes black” a new problem or has always existed? It is a new problem. It doesn’t happen with each login, only about each 2nd. It does not happen if I de-install KSK. It re-appears if I re-install KSK. Have you deleted & recreated your son’s Windows profile & rechecked? yes. If a “dummy” child profile is created, at login, after entering the password & pressing enter, does the screen black ? Not tested. What would be the difference between a real profile and a dummy profile? Has KSK been uninstalled & reinstalled? yes. Any idea? best Slooti