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Indeed, there is a problem.
I finally figured out what it is.
In the latest HD version, build 3.811, version 4, the multiplayer is not compatible with previous versions.
If you play 3.811 build 4 vs 3.811 build 4, everything is fine, but if you play against earlier versions, both will receive incorrect data from each other.
I will release a fixed version within the next 24 hours.