It's a very good possibility that a missing .sim file is the problem.
Where the missing .sim does not seem to effect the single player Game?
Multi-player appears to be much less forgiveing in this area.
It may be easier to change them to a land object.
Land objects use a different type .sim file.
And all Barricade units are, infact, resting on land.
The Maunsell Sea Forts are Land Objects placed in the open Sea.
They use a .sim but don't seem to crash Multi-player.
It would require adjusting the Campaign files
along with other files.
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