OK, thanks for the help so far guys. Here's more detailed info:
I was working on this model:
[imgl:101a2ae54a]http://www.membres.lycos.fr/actofwar/155mm.jpg[/imgl:101a2ae54a]
I made it from scratch in a 6-hour long run, never testing it. I finally had it modeled, skinned (WIP), rigged, and ready to go in the game. I go to export it, and as it gets to TREADS02 (the left treads) the exporter stops. I wait, still nothing. I click on RenX, and it says that RenX has had an error, and must close, "Do you want to try and save a copy of the current scene?". I did, and booted again. I tried to export it over & over, same thing. I then deleted the offending tread. It then crashed on the muzzle FX. No matter what I do, it stops somewhere each time.
So, last night, after I got back from dinner, I tried again. RenX wouldn't boot.

I think it was a "corruputed" error.
This morning, I installed a Windows update. Now, RenX will boot, but I'm still getting the export error! This didn't happen on another model I tried, either... HELP! :dead: