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There was a crash at the very beginning of map generation.
When the turn passed with quick battles enabled, the computer killed my unit. It happened in the field. So, the bug remains. And it seems to trigger either intermittently or in some other way.
Also, sometimes the password for the opponent is not requested during a new (especially the first) map generation.
The "Complete Collection" version (Russian) does not connect with others and reports an error. I don't know what the difference is, but after replacing the executable (it has a shield in the icon) with the one from "The Shadow of Death" (with a skull in the icon), everything works fine.