[jazman]

Here's what I did to "resolve" this issue. I hardly know if it's a repeatable thing.

I went back to the end of the previous patrol, "in base after mission". I re-handed out all the awards. I started a new mission. It said start at Wilhelmshaven and end there, too. No message at this time about changing to Brest.

I go out, and darned if I don't get jumped by some planes that destroy my radio antenna. So, if there's any message during the patrol about changing my base, it ain't happening.

I get back to Wilhelmshaven, and the next mission has a NULL grid, but the target is Brest. And this time the port is on the map. So that's where I am, having done a free hunt, and completely botching my first convoy attack.