Alright.
Posting this as a reply to separate the two and point out an error on my end.
Apparently Dgen.exe refused to close down with the game, causing the minimising thing. Ended it and now I can start new campaigns just fine.
So.... sorry for this.
I hate it when I don't check everything before reporting something... >.>
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Something new.
Now I get the aforementioned error every time I start up DCG and all the data for the campaign is messed up. With a new, clean DCG install.
Will try a new IL2 install next.
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Ok, done with work today, so let's do further testing.
It happens every single time with the campaign in France and the fictional Battle for Britain one.
The one set in 1941 Normandy works fine again.
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Ok.
From the West campaign it's France '40, Britain '40 and Lybia '43 that cause silly things and make DCG show the squadron window devoid of squadrons. All the others seem to work fine.
Would've loved to have a consecutive campaign through the whole war, but ah well. Guess I'll have to get "wounded" for a year or so, hehe.
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Interesting, at least to me. Those three maps I mentioned won't work with any other nation either.
Could this simply be a 4.11m incompatibility?
For the time being I just removed them from the campaigns I intend to play through.