I am trying to upload this model, and no matter what I do to fix it the manifold issue is not resolving itself. I am modeling in maya 09. I have a simpler model, that I was having the same error on and I resolved by doing a "cleanup" on it, and there is a checkbox for non-manifold geometry. I tried doing the same on this model, and it's not working. Now I am sure this model is a complete mess, but it is what it is. It's basically a logo, or I call it a shield, that a bevel/extruded, at various depths. I actually want it bent around a radius, and I know how to do that, but for complexity sake, I want to get this "flat" version of the file working first. I would rather know where/what is causing the issue, rather than just having it fixed. Thanks in advance!