[spooky]

Well im not a user of any plugmod but i think that the game may have been patched with a pal patch and not an ntsc one.

someone correct me if im wrong but i believe the plugmod would scan your backup for movie and audio files only and let you play them therefore bypassing the region code at the start of the disc and playing in ntsc.

So if you patched the game with a pal patch, when the game is started it hits the region info and changes to pal giving the effect you stated

hope this helps.