We found a new issue, that install folders with a "." will crash on starting a new campaign and will have many other issues (like missing skill icons) because it cannot find certain game files.
Temporary solution is to remove the "." in your install path.
I tried renaming my install folder as stated, even if I don't got this crash issue. But every icon (skill/unit/building) in my version of Dragon Commander (pre-order from GOG.com) seems to be nonexistent... only a blank background is showing.
Everything else works fine.