DVD problem

[Matt]

I recently purchased cannibal women of the advacodo jungle of death on DVD from Amazon.com, unfortunetly it won't play in my piece of junk Emerson DVD player, but it will play in my parents (who are about 3 hours away) cheap Korean model.  Both players say that they play region '1' and 'all', and supposively CWAJD is region 'all'.  Any ideas as to why it won't play in my dvd player??

[Brock]

It goes in shiny side down, man, I don't care *how* much you like to look at it...

Seriously, though, I have no freaking clue.