Well this is rather strange. It would appear the online live weather system we use is not always returning the wind direction, therefore it defaults to zero (360 degrees). Obviously the online weather system is nothing to do with me so not much I can do about that. However, this was only meant to be an interim measure until (a) Asobo fixed the weather interface for FSUIPC or (b) Fixed the sim weather. I know (a) is still not functioning but maybe (b) is better these days.
So, as a suggestion/test, for your next few flights do NOT select to use 'Live Weather' when prompted and let PF3 use the FS weather. Unfortunately that does me if using ACARS to check the weather at your destination it won't actually work! I'll be interested to see how you get on.
In the meantime I'll raise the issue with the online weather support team and also see if there's anything I can do as a workaround.
Thanks for raising the problem and supplying the logs
Later:
I had a reply from the online weather support...
This can happen if the weather station does not supply the wind direction.
This is a source limitation and not a bug!
Helpful, eh?