Uberto, I also have systematically this problem with several airports. I also verified that with SU10 Navdata disabled, it solved the problem, but I have re-enabled it after my tests, because I need it for addon I bought on Marketplace.
For now, I have added a "start couatl" icon in my taskbar on the bottom, so I can easily launch the engine just before the landing, when I do not forget to do it ! Otherwise, I am punished with the spinning Menu and must do it after landing !

My question is: can we hope you will found a solution ?
For your information, like you, I suspect it is the airport data loading which should crash couatl engine. But what is interesting is that, when you reload couatl manually, after landing, the engine didn't crash again, but, for sure, the airport data should be corrupted or incorrect, because it do not fit with the reality. I have had several time gate position, mentioned as available by Couatl choose menu, which were, in fact, occupied by an AI aircraft (and I am sure it was not because this aircraft took the place in the meantime I went there, moreover I have all traffics disabled). Hope it might help to understand the problem. Cheers !