you can see a model behind another one which is trasparent ONLY if his collision integer is smaller (EG: if big ball is collision Category 2, small balls are collision Category 1, you will see only the small ball behind the big one, while u won't see the big ball behind "trasparent" small two which are in front...
If Category integer is the same, then Spawn order is taken into consideration...
If i've not been clear enought (and i suspect this) try playing with collision Category and spawn order to understand what i mean...
from http://www.opengl.org/resources/faq/tec ... arency.htm :
"15.050 Do I need to render my primitives from back to front for correct rendering of translucent primitives to occur?"
maybe i can guess the problem... ZGE draws things in some order related to the collision, and the spawn order, am i wrong?

If u fix this in next release, i'll post the Breakout clone i'm working on... when it's almost finished

...although i can get my game working even if u don't fix this...

BTW: i suffer from smoothness drop when i move my mouse in the window of a game created with ZGE... FPS does not get low.... but it seems to not refresh screen properly.... I'll try to understand if it's a problem of mine...
Bye bye!!!