Hi,

I had this problem as well with Mudxbox 2011 <-> Max 2010. What fixed it for me was updating to the newest version of the FBX exporter, v2011.3.1

http://usa.autodesk.com/adsk/servlet/pc/item?siteID=123112&id=10775855

You might also try the STL Check modifier to find problematic geometry, I’ve had to use that for the esoteric ‘rats nest detected’ error.

UPDATE:

Sorry, I’m still getting this actually, though not on the same objects. I imported an FBX of the tyrannosaurus base mesh from Mudbox 2011, split it down the middle and added a Symmetry modifier to rough out some extra areas.

After collapsing, my FBX export fails and I wind up with all tris in Mudbox. The object is all quads, no ngons to start with though. Not sure what I’ve done to these mysterious edges.

Very annoying.

best;
-green

hey man
here I had the same problem
I exported to obj and imported again and didn’t work
BUT
I saw 2 polygons in my model agreeing five vertices. just del them, and voilla ! FBX export cool !