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Only Natiional Guard and Irish Brigades used custom BH3s. They all checked out in the clear.
So clearly it isn't an infantry issue.

Arcturis mentioned water - but water has not proven to be the issue.

Civilians - not likely. They are unchanged.
Infantry - not likely. But we have yet to test US Pikemen.
Artillery - again not likely but the Supply Wagon has not been tested.
Ships - Only Swedish Gun Sloop has not been tested. But it should be working fine, right?
Cavalry - Continental Dragoons untested.

Need to go back and check patriots one last time, the last time we had a crash it happened just as we were creating a Patriot.

I am so tired....

Still can't track down the issue.
Horse units don't seem to be the issue, but I could be wrong.

I am starting to believe that it is a missing BH3. The best way to deal with this issue? track it down.

Start off with ships.
Then artillery.
Then, infantry.