Sounds like a movie about people eating Zombie Flesh. That can't be good for you.
I checked out the title you gave at the IMDb and it says "Zombie Flesh Eaters" is a little known film called "Zombi 2" AKA "Zombie." I am, of course, being silly when I say that that puppy is little known. I haven't seen it, so I can't say anything about it either way, but it has its defenders and detractors. It's an alleged sequel to "Dawn of the Dead," in case you care.
Now, this doesn't mean that Z is the ZFE that you saw; just that the IMDb says it is. I did a general search of Amazon and Blockbuster to see if a new film was coming out soon and I found nothing there (which, again, means very little.) A little more detail on the poster might clear things up one way or the other. The IMDb does have an earlier poster for Z, here:
http://us.imdb.com/Title?0080057. If that picture looks like the poster you saw, we might have a match.
Hope that helps.
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If your curious, you can find reviews for "Zombie" here at this very site (
http://www.badmovies.org/othermovies/zombie/index.html) as well as at Stomp Tokyo (
http://www.stomptokyo.com/movies/z/zombie.html) and Teleport City (
http://www.teleport-city.com/movies/reviews/horror/zombie.html).
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Small side note: Blockbuster.com lists "Night of the Living Dead" as "Night of the Flesh Eaters." For some reason I can't explain, this struck me as amusing.