i sorta get the same problem when i use the set display,
if i compile my program in one format say (800,600,16) it looks one way, then if i use the command set display 800,600,16
the look of some of my objects change(usually skyshperes)??? i've found that the scale of objects, one really large next to one really small, the large object has problems beings seen properly??
this only happens when i use that command? so i generally don't use it
don't know why an object would disapear, but i'd bet its a scaling issue, just a thought
My advice is free -
unfortunately you get what you pay for (-: