From the Release Notes:
Known Issues
Today’s Sim Update 15 Beta build (1.37.4.0) contains stability fixes to address sim crashes and instances of black avionics (which have been the top reported issues from the Sim Update 15 Beta). Unfortunately, while making comprehensive changes to improve these two issues, a handful of new issues were introduced:
1.37.4.0 Known Issues
- Aircraft with floats are unable to take off/land on water.
- Reverse thrust is not functional on certain aircraft.
- When launching a glider, releasing the winch causes the sim to crash.
While often we would not release a build to the flight groups with such obvious issues, we need community feedback on the stability fixes as soon as possible to understand if the changes were successful or if we have more work to do. The next SU15 Beta build (planned to release to the flight groups next week) will include fixes for the above three known issues. We will not release Sim Update 15 until the above known issues are fixed.
If this significantly impacts your sim experience, as a reminder, you may leave the Sim Update 15 Beta and return to the current public build at any time by following the steps outlined here: Welcome to the Sim Update 15 Beta
Thank you for understanding and participating in the Sim Update 15 Beta!
Thanks,
MSFS Team