And a few day’s later there is a new update for the beta testers. v1.6.5.

Known Issue

• This build contains a known issue that can cause infinite loading times on certain flights. A fix is in development for a future build. Areas that can cause this issue include, but may not be limited to, the following:
  • Cardiff
  • Cliffs of Moher
  • Darwin
  • Dublin
  • Melbourne

Stability & Performance

• Fixed an infinite loading when starting a flight with a scenery from a package, then stopping the flight and disabling the package, and restarting a flight at the same location.

General Bug Fixes

• Fixed an issue where a stutter would appear after a short while in the ATC
• Fixed an issue where the traffic was resetting when opening the weather panel
• Fixed the multi-window delete button in the general advanced options
• Fixed non-Latin characters not being rendered on the company name

Physics

• Fixed OBJ_EA1_SURFACE calculation of airfoil surface normal (Z component)
• Fixed initialization of “modifier_position_scalar” & “modifier_surface_relative_position_scalar” in “[OBJ_EA1_*]” sections of flight_model.cfg when not explicitely specified.

Aircraft Tech

• Added checks for missing interaction file upon loading navigation graphs (this will help aircraft developers detect mistakes that may break these interactions)

Missions

• Fixed cruise back on track in ferry flight, cargo transport, private charter and, commercial flight.

Search & Rescue

• Fixed bush takeoff objective missing “Remove parking brakes” step
• Fixed back on track happening when player is outside the aircraft

DevMode

Project Editor

• Added INPUT_PROFILE content-type to the project editor which can be use as a filter in the Marketplace

SDK

Exporter Blender

• Reworked material emissive scale to improve viewport visualization and make value ranges easier to interpret. See EMISSIVE_PREV.md for details on setting up the viewport for correct preview
• Added automatic ‘make relative’ on save: external files (textures, links, libraries, etc.) are now saved with relative paths instead of absolute ones, preventing missing file issues when sharing .blend files. This behavior can be disabled in the add-onpreferences.

Read more about the September 11th 2025 update here.

Finally, the National Championship Air Races kicked off yesterday for their inaugural year at their new home in Roswell, New Mexico. To everyone in our September Family, the Microsoft Flight Simulator team wishes all of you a week filled with thrilling races, excitement, fun, and friendship!