Couatl (GSX PRO) make the sim crash?

[Hester40MT]

See also:

couatl64_MSFS.exe causing CTDs

This is the correct answer. MSFS is a very processor intensive application and running too much third party software alongside MSFS can cause problems. Some third party apps such as GSX Pro and FSRealistic tend to cause more issues than others from my experience, especially when paired with the more advanced airliners like the PMDG, Fenix A320, etc.