[Mobhack]

Looked at the save game.

As with most end-user saves it is post-event, so it is rather useless for debugging. Debugging wants a save prior to the event and a precise method of obtaining the post event result. In other words - it has to be repeatable.

My prior comments stand, though looking at this map it is probably micro-smoke that has built up in an intervening hex.

And this is backed up by pressing the end turn button - when the unit came under mortar bombardment. Artillery fire is a very common way of providing micro smoke into an area!. The unit post that, could see even less along that sight-line.

Assuming that it had been shelled prior to the save - not mentioned in the original post - that is the probable cause.

Micro smoke is only noticeable by noting unit changed LOS (otherwise maps would be more choc a bloc with smoke puffs) and usually disappears in the next admin phase - enemy or friendly. It is a feature of the game since the original SP series that micro smoke is not reported in any special manner. It typically only affects "edge" hexes of a LOS fan - like your situation, looking down a stream line in woods. It's usually of more importance as map visibility reduces and so LOS penetration into cover is reduced.

Cheers
Andy