B3DPipeline Billboards

Hello

I'm using the B3DPipeline and when I try and display a billboard I don't get to see anything. If I export without the billboard flag the object appears fine, with the flag there's nothing there. Here's the code...

The intialisation, MainCamera is created and parented to my player entity...

extModel.EXT_Entity = EXT_LoadEntity( file$ )

EXT_ActivateEnvironment(extModel)

CameraProjMode(MainCamera, 1)
EXT_SetRenderCam(MainCamera)

This gets called in the update...
EXT_UpdateEntity(extModel)
EXT_UpdateRenderCam( )

Any ideas?

Thanks

Scott