Actually, I think I found the problem. The game does not accurately record whether the sub is surfaced or submerged.
In the current case with my Type VII, the sub is shown to be underwater. However, my crew are in the diesel engine compartment. So, moving the telegraph does nothing (but I do not get a "cannot comply" response). I move my sailors to the electric engine compartment, and I do get a "cannot comply" response when I move the telegraph.
It seems that the game has recorded whether the submarine is surfaced or submerged incorrectly, and yet won't move backwards or forwards. Thus, surfacing if the bug occurs when submerged, or diving if this occurs on the surface fixes the problem by getting everything to line up. Something in the files relating to whether the sub is submerged or surfaced might be getting corrupted, because this happens especially often when loading a save. It will, however, happen mid-patrol too. However, when it happens mid-patrol, that is when throwing it in reverse works.
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