The throw modifier is a code that can change the properties of throws. If you're playing a hack that utilizes it, turning it off is definitely significant. If the hack you're playing does not use it, we might question why it was ever on.
Of course, some of the other explanations were plausible too. If you want tech support explaining issues, giving a detailed explanation of what you were doing would be important.
Also, just throwing it out there, I can't speak for any other projects, but I do know Bbrawl does not, never has, and never will crash when loading Corneria or any other stage. Any codes associated with Bbrawl definitely are not causing that.