Every other triangle rendering black

Any thoughts on this one?

Here's what's happening:


Here's what I expected:


Any thoughts?

Convert quads to triangles in Blender...plenty of threads about this on the forum...

Alot of theses basic issues are asked over and over... simply watching the video tutorials would answer all the questions people might have but people are usually too excited by the SDK and start working on their own version of Doom4 for iPhone right out of the box without going through the basics...