UV Unwrap Incorrect Vertex Location I'm having a bit of an annoying problem when unwrapping a model of mine.  

The model is pyramid-like, with two sets of polygons angled away from each other connected by a rectangular band running around the middle:



The problem is when I unwrap using the standard method (U -> Unwrap), the top and bottom parts are malformed, with one edge of the tip being shorter than the other (below, left).  

However, when I use standard unwrap but with the conformal method rather than angle-based, it seems to be correct (below, right).



The angle-based unwrap seems to be placing one of the vertices in the tip incorrectly but I can't seem to figure out why.  All values should be correct (scale, rotation, location) and normals are good.  

I've typically been able to get good, consistent results with the angle-based method.  Is there something I'm missing this time around?

Thank you for any help in advance!
Well, I may be a bit of an idiot, but I found the issue.  

The two front vertices were missing the edges that would have connected them to the edge running back to front.  Old mesh (left), new mesh (right):



When unwrapped, results were as desired:



Thank you to those who responded!