JFDuke crashes on some of my maps with the message <<The instruction at "0x0047cb10" referenced memory at "0x014cb6a0". The memory could not be "read">>. Particularly, this map has crashed time and again: Dawn in Arctica. It can be found here:
It is a certain area that always makes it crash: facing the direction which you have by default when spawning in the map (ie. looking toward the room's door), that area is some distance behind the start room/cabin and to the left (near some rising stairs and facing the yellow door). There are some alien eggs. The crash doesn't happen exactly at the same spot every time.