Using EVS in a 1.9.1 game, I get the following error: [ERR 22:25:52.859] ADDON BINDER: Cannot resolve assembly: KSPDev_Utils.2.0, Culture=neutral, PublicKeyToken=null [ERR 22:25:52.859] ADDON BINDER: Cannot resolve assembly: KSPDev_Utils.2.0, Culture=neutral, PublicKeyToken=null ...which might rely on the same flaw as this one: https://github.com/jrbudda/KerbalEngineer/issues/52