[idf]

There is a workaround for your problem. It only happens when the patrol that the problem occurs in started with a windspeed of 0km/h. The thing you can do to sort things out is to simply exit the game, re-run ShWeather specifying another windspeed (there should be something concerning the calmness of the sea among the parameters you're allowed to tinker with - go for heavy). Re-enter the game and the save should work now. It does the trick for me.