SObject bug or limitation

[woodn]

After making a SObject with a Box (A) and a wall (B) then viewing it in BTB, the wall (B) does not show. Playing around I found out that if I set the space before wall (B) to 0.01 it shows, which is great but now I have a gap after box (A) and wall (B).

 

[woodn]

Snap of the SObject might help...