Crash after toggle replacement on

[Seskhan]

When I toggled the replacement on button for all units in the LCU list, the game will crash without any warning. It seems that only the Campaign game and the Saragossa scenario have this problem.

[Alessandro S.]

Confirmed. I think I fixed that. We are about to release the next update any time soon and it should no longer happen there.
The issue is when no larger unit like a DIV or BDE does exist in game data. A workaround would be to rebuild one of your units into a DIV or BDE parent. That should make the button work.