Update one day later: Now it works again. Weird. The original post: Hi there, out of nowhere the Smart App Control in Windows 11 has started blocking the TrainSimWorld6.exe. Had no problems yesterday and nothing has changed as far as I can see. Anyone else having this problem? Other Steam games are unaffected, and according to what I've read this has to do with a certification on the developers or publishers side. Have also verified the install and restarted the PC.