When it happens my "Add-ons" menu is missing all of the Couatl items like it's not launching correctly when the sim loads.
When this happens, check if you still have a Couatl.exe running from the previous session. This will prevent a new copy from starting. The most common reasons for having Couatl.exe not closing after exiting from the sim are:
- You re-launched the sim too quickly after it was closed, not allowing enough time to close all the applications it started from the previous session.
- The sim crashed (sometimes even silently, with no visible errors) for other reasons, so it couldn't send the message "please close yourself" to Couatl, which wasn't in turn able to close itself properly. We are keep trying to find new ways to react to a sim crash (not caused by anything related to FSDT), but it's not very easy, because sometimes an abrupt crash leaves the system and open files in a bad state, which would require a Window restart anyway.
In both cases, either Terminate all instances of Couatl.exe with the Task Manager before starting the sim, or restart Windows.