And this is what happens in game: SOLVED?: So I may have inadvertently answered my own question. Due to the meshes being combined, for whatever reason, the game had established the pot texture as the default texture for that group. As most of the work on this mod had been done a long time ago and I couldn't remember how I had done some of the material swaps, I reworked the material swaps the "proper way" for the pots and regenerated the necessary data, which fixed the problems I was having in game. Consequently, if you place an object in the CK and change its associated material before converting it to a static object, the CK will create a CustomMaterialSwapxxxxxx for that object, which appears fine until you generate the PreCombine and PreVis data, which seems to break this in game, and it turned out that I had created a couple of objects like this. At least, this is my conclusion. To fix it, I recreated the material swaps by duplicating the aforementioned CustomMaterialSwapxxxxxx entries and reapplied them to the appropriate static objects. It all seems to work in game, but who can say? Cheers.