Wicky
The problem at the end of Night Stalkers is well documented here - and the subject of a number of threads and many posts.
The only way I have managed to open the next battle in the campaign - and believe me I've tried everything in desperation - is to surrender. I know, it's a bit galling to surrender a battle when you're winning, but as a Commander you have to think about the whole Campaign, not just a battle... Others seemed to have got past the point by reinstalling and other means (but didn't work for me). Let us know how you get on..
I know how frustrating it is having got so far in the Campaign and I hope BF gets around to fixing this, but, having moved on, I have concluded that it's a minor irritation in what is otherwise a great game and the only one I play.
I'm looking forward to the Brit module and hope that the Campaign there won't stick..
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Knotso - frustrated