So I realize this is a ridiculously dead thread, but rather than start a new one I figured I'd add here. I think I've solved one related issue attached to this crash (and others of this style) Recognize that most of this is just thought, as I haven't messed with the construction kit at all. I do know however that it fixed a specific issue I ran in to. We've known it has to do with the inventory, at the point where the OP crashed, your inventory would be removed and stored in some temporary container somewhere. Why they did this /and/ disabled access to your inventory is beyond me, but they did. Now from here, I've seen two different descriptions of the problem- the first solution was mentioned by thepaan above, but the second is more mod related- specifically on any that do mess with inventory. The 999 item fix doesn't work, and in fact it becomes seen that a specific item, or the last item causes the crash. I'm a programmer, so I'll discuss it in those terms as it'll be easier to explain. Normally, an inventory system is much like a list or a bag, but these data structures use an integer (sometimes signed, sometimes not) to be able to return, quickly, the length of the structure itself (in game terms, how many items or types of items you have in your inventory). If this returns an inappropriate value (such as a negative number), it's entirely possible based on implementation that the game will crash. Now, if quest items don't count towards this length*, and then one is removed programmatically through a means (such as a function) that would cause a decrease in this length, we have what's called an off by one error. This may not manifest itself as an issue until the off by one throws a memory out of bounds- causing a CTD. Because the length of this structure is tied to the save file and not to any mod, removing mods will not fix the problem- only regaining the item that was inappropriately removed will. Provided it wasn't forcibly removed forever, it is likely in a storage container that you accidentally (through a mod) put it into, all you'd have to do is find it. *Note, it is also possible that quest items do count towards this length, and that there is some type of error checking that can cause the CTD if length is below some acceptable value.
