Game crashes by using map
 

Hello there.
I had a strange experience. The game works fine until I want to plot a course, then the game crashes. Using the M-key or clicking on the navigationofficer... it doesn't matter: boom! CTD.
The strangest thing is that I had not this problem in the 1st mission, British coastal waters. This problem pops up in the second level. Why oh why? Again: everything else works fine, only plotting the long range course on the map is not possible.