Using Carrea 5 pro from the 3dWorld 100 cover disk here.

As part of a model I make a boolean object using 2 imported .OBJ shapes to act as a door way.
I make another boolean object as well using 2 cubes within Carrea, nothing imported.

As the 3 images show - the export looks OK in deep exploration.
In Vue 4 one of them is iffy. In Poser it's even worse, both bollean objects are clearly screwed up.

 

Pinky - you left the lens cap of your mind on again.