Report Alpha 26 Feedback in Bug reports Posted September 30 16 hours ago, Gurken Khan said: Set an exception for pyrogenesis.exe and/or your whole 0ad folder in Windows Defender or any antivir you might be using? Thank you for the tip. You were right. Controlled Folder Access in Windows Security examines applications that can make changes to files in protected folders. Occasionally, an app that is safe to use will be identified as harmful. This is because Microsoft wants to maintain its security and sometimes overdo it with caution. However, this can interfere with the way you normally use your computer. You can add an app to the list of safe or allowed apps to prevent it from being blocked. I set the "folder cotroller" off and now everything works fine.