Blender 2.62 Navmesh not showing up!!!

Hello everyone,
I am making an FPS game in blender, and I am trying to get basic AI to work by using the navmesh feature. The only problem is, that when I click Build Navigation Mesh, it load for a minute, but no navmesh shows up. It says that its there in the Outliner, but there are no flashy colors. The plane I am using is pretty big, so I dont know if that is a factor or not.

Thanks.

Here’s the Wiki tutorial for navmeshes:
http://wiki.blender.org/index.php/User:Nicks/Gsoc2010/Docs

I’ve not used them myself so I don’t know how they work, but it seems like you may be better off manually building it.

There’s a video tutorial here too:

P.S. This is a bit of an onld thread, but ou posted in my project so I thought I’d return the favour.