Hi!
when I run the game engine I see some columns I have as being transparent instead of white. How do I get this the way I want it?
This is render:
This is in game:
It’s the problem about faces facing the inside of your objects.
1 Think you should remember when making games in blender is that the meshes you make are always closed as well that inside the closed meshes there may not be a face splitting that mesh.
You can fix this by going into editmode, select all vertices with A and press ctrl+N to caculate the faces to the outside. No the faces are facing the outside of the model and it will appear solid instead of transparant. 
You the man!