well obviously something change if the same models worked before.
i don't have this issue neither with C4D nor Sketchup though. (anyone tested blender with the new patch?)
so i guess something is "wrong" with 3DS in general (which i haven't used in a long time but can install it if needed), your 3DS release, it's export or your workflow.
afaik CSL doesn't care about any values in the exported fbx (dae,obj) but the raw mesh and uv data. (thats why the community created a plugin to fix sketchup exports btw)
so eg. if some parts of your mesh use deformers and those somehow get stored in the export, CSL won't care about it and the actual mesh coords make no sense anymore. looking at OP's screen i dont think there are "extra" polys added they just have wrong dimensions for some reason.
there aren't to many possibilities in this issue so don't worry to much.
if one of you guy could post something like a simple cube with some simple geometry attached to it showing this behaviour this would help a lot.
for now we don't even know which 3ds version u guys are using so it's kinda hard to tell.