I get this weird problem when I apply the Subdivision Surface modifier to my model in Blender.
What is it and how do I fix it?
This is what it looks like in Blender.
Just a guess, since I don't use Blender, but that looks like your vertex normals are inverted along that series of edges.
In edit mode: press A to select everything and then ctrl+v and remove doubles.
If this doesn't fix it, report back.
Oh and also ctrl+n to fix the normals.
The crease was apparently caused by an edge going straight through and inside the model.
The weird shadows on the leg was fixed with ctrl+n.
Thank you very much!