I have a minor, but recurring problem, namely I often lose the ability to use the "depth under keel" command when I re-load a save game.
The command works when I start a new mission/patrol, but disappears if I reload a save game. At first, I thought it was caused by switching/tweaking mods while on patrol (a bad habit, I know

) and making no changes at all during the patrol seemed to initially solve the problem, but now it has come back on the latest re-load.
There were other threads here of other players with the same problem. Did anyone ever figure out the cause?