I am trying to use polygon > boolean > difference but i am having a problem. The first time i use boolean its fine and i get the hole i want but when i use boolean again on the same polygon object in another area, the whole object just disappears. I've tried deleting history and export, importing it but again no difference. I have also tried freeze transformations but it still won't work. It is still in the outliner but i still can't see it on screen, any help on how to get it visable or how to make it work would be grateful, thanks.