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It could have been helpful for someone else struggling with the same situation.
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It is a crying shame that the root cause for this was not found. God only nows, what caused this change: The new installation "touched" my Steam account and fixed it? Or maybe some auto-diagnostic at Steam servers detected the corruption and fixed it? Maybe someone from Valve read my woes and sorted the thing out.? This the took place with every mod i subscribed to - one by one - so everything appears to work just fine now. This was new! So I launched C:S - and the mod is there! This time Steam reported it downloaded a few kb of data. If you no longer want an item or mod in your game, you can simply unsubscribe and Steam will remove it. This process works in lieu of downloading or installing individual items from the Steam Workshop. So, I tentatively subscribed to the "81 Tiles (Fixed for C:S 1.2+) " mod and launched Steam. If a game supports Steam Workshop, simply subscribe to it to access its stream of modded content. (I hadn't even realised, that those were supposed to be listed there as well.) There were no more the two mods only, that I had left subscribed since I tested this problem last time - instead there were all the assets I had subscribed to long time ago.
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Having installed C:S on the other PC, I logged in the Workshop - only to find that the view of my subscribed items had changed 100%. (I don't presume you'd have a similar short-list of items to check on Steam, do you.? ) So it looks like my Steam account is somehow corrupted. The same problem there - no mods, assets only. Just completed a fresh install on another PC.
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