I'm not very good with computer-tech, so I apologize for not understanding most of this. I'm not entirely sure what a registry is, or how do I access it and give you a copy?
If this is any help, back when we tested at which stage the game crashes, the game logs would have this difference in the command-console:
Any normal player would show:
Allowing player with ID##
RequestToEnterGame ID##/'steamname'
Crashing player shows:
Allowing player with ID##
Crash!!!
(Yes, the game log actually says crash, and then disappears, no error, crash logs, nothing)