Hello community, I am new to the X-Plane world ;-) After trouble-free installation of the FF 757 and Amsterdam, nor the Saab 340A should enrich the hangar. Bought, installation, end. X-Plane (64 bit) will not boot ... "Fatal Error SteamAPI_Init () failed ..." I use X-Plane via Steam ;-) Apparently, the Saab and Steam do not like? The most important insight -> if the "Gizmo64.plugin" removed from the resources / plugins folder, X-Plane starts again. If I read correctly, the Saab needs this plugin to work? A few more information to isolate the problem: - Only the 64-bit version does not start - Steam is of course connected - X-Aviation credentials are entered correctly when installed - X-Plane checked via Steam on error -> no change - Installation of Saab to run again -> no change - Loaded latest version of the plugin Gizmo64 - -> no change - Mac OSX Firewall is disabled -> no change Attach Files: GizmoLog.txt & Log.txt Someone further ideas or even the remedy? Preliminary ever thank you! Christian PS: thank you google for the translation :-) GizmoLog.txt Log.txt