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okay, i was banging my head against this for THREE WEEKS... and i still haven't figured it out. so i have a couple of poll questions. A: Have you ever built a lower-LOD version of your model from scratch (and had it work/upload)? IE: for some reason you didn't take the full-res object and decimate it somehow or other to get the lower-res version. B: Does the SL mesh importer stretch the lower-LOD models so that their bounding box matches the full-res model's bounding box, the same way it stretches/squashes the physics model? tl;dr------------------------------------------------------- i made a simple cushion/beanbag chair, and then i built a really low-res physics model for it. (if i had been older and wiser, i would have had the foresight to just have saved the original box model i started with, but. oops.) the automatically generated lower res versions were... crappy. and had more triangles. 'i know!' i said, 'i'll use the physics model as the lowest res model!' but all i ever got was 'material is not a subset' errors. and yes, i worked through all the fixes on this page: http://www.pader.world/fixing-errors-on-mesh-upload.html i took the physics model and i put the three materials of my object on it. my 'object' was also technically TWO objects in a linkset. (one with 2 materials, 1 with 1 material.) so i divided off the 3rd material's faces into a separate object, also. this is where i got the weird result of this square, which was supposed to be the flat bottom of the mesh, ending up as a diagonal plane through the seat of the chair. (leading me to suspect some bounding box thing was going on, though i could not find any reference to that, anywhere.) since i can't get, by hook or by crook or by ImportLegacyMatching, this thing to recognize my other model's materials as a 'subset' of the original model's materials (yes, the same exact materials, no .001s)... i'm starting to wonder if the actual VERTICES need to be... i dunno, actual vertices that were in the original model somehow. :/ OR... maybe it can just never work on two separate objects uploaded as a single mesh thing? looking for clues, so that's why i'm asking those with more experience in mesh than me.