Quote:
Originally Posted by max-peck
There are two mods that come with GWX that could cause this problem.
They are
GWX - Indian Ocean Campaign Files Only
GWX - Black Sea Campaign Files Only
You didn't activate either of these by any chance?
Doing so will remove all the traffic from everywhere in the world except either the Indian Ocean or the Black Sea. They are designed to cut down on loading times if you are operating in those theatres only.
EDIT: ps. welcome aboard 
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This was indeed the problem!
I had 'Black Sea' installed but have now removed it, thanks very much for the help guys. I was beginning to think I'd broken it, I've had this game a long time but never got around to putting GWX in to it before so I suppose it's a case of learning from the start again.