I had a similar problem once.
Allegedly, you can try fiddling with the 'near' camerarange; i.e. set it to 0.1 instead of 1. Someone told me about this solving a similar problem that he had been having (although my problem was more to do with alpha textures than anything else as it turned out).
Also, I've found in the past that messing with CameraZoom can totally stuff up the draw order in some cases, so it could be that too.
You could also try switching WBuffer on and off to see if that makes a difference.
If I'm barking up completely the wrong tree, feel free to post a screenshot of the prob. :)
Allegedly, you can try fiddling with the 'near' camerarange; i.e. set it to 0.1 instead of 1. Someone told me about this solving a similar problem that he had been having (although my problem was more to do with alpha textures than anything else as it turned out).
Also, I've found in the past that messing with CameraZoom can totally stuff up the draw order in some cases, so it could be that too.
You could also try switching WBuffer on and off to see if that makes a difference.
If I'm barking up completely the wrong tree, feel free to post a screenshot of the prob. :)