I am having a lot of problems with skin weights. I am trying to decide whether it is my problem, or a bug in the Mesh system, so that I can deal with it and maybe report it. I am gradually optimising and improving a rigged version of the SL avatar mesh. It is almost complete. But I can't get rid of nasty "spikes" between the legs. (Very uncomfortable!) Here is what I see on Aditi http://img18.imageshack.us/img18/971/screenshot20110724at162.png You can see it looks like this vertex is weighted to the wrong leg, but look, here is what I see in Blender http://img580.imageshack.us/img580/971/screenshot20110724at162.png (Sorry, I tried to inline the image but SL forum just says "Unexpected Error" when I try to choose the file.) The vertex weights are to the correct target: mKneeLeft. There is no other weight to a bone there. Also, if I re-import the Collada back to Blender, the result is the same. Only a weight to mKneeLeft. But in Second Life, there is a big spike towards the other leg animated as if it is weighted to there. So, any ideas? Time for a JIRA?