No, the regions are light green. I knew the mistake was between my ears. I haven`t played the game for a while, so I should have read the tooltips carefully. Again, sorry for wasting your time
I have installed patch 1.02 candidate and I have started a new game playing as prussia. And right from the start I can`t build anything. No coalmine, no harbour, nothing. When I click on a coalmine several regions are green. But the tooltip says: This building can`t placed here. Has anybody an idea ...