I started getting too many "disc read" crashes on my original FNV disc, so I just bought FNV online from Xbox Marketplace so I could play it without a disc.

Now when I play, whenever I turn (pan left to right), the image that's displayed looks odd, like I'm seeing multiple images.

So I'm wondering if anyone else who has purchased the game online for Xbox 360 has had a similar experience.

Thanks.....

How do you mean?
Like when the character faces foward but their hips and legs face right/left and and run?
I've figured this to be normal behaviour rather than an issue.

When moving the Right Stick left to right. If looking at the Lucky 38 tower from a long distance and moving the Rigt Stick left -to-right-to-left, will see double image of the top of the tower. Also, when in Zion, will see mutiple images of faraway mountains. Been a while since I've played the game from disc, so can't compare.

Though tonight the game kept crashing. Even gave me a disc read error, even though I'm playing from hard drive.

I think I know what you mean now, I remember getting that on Modern Warfare 2 before grid lines began appearing and I got 2 red lights.

I'm not to sure on a fix but have you tried uninstalling it and then reinstalling it, that might ease it slightly but I can't guarantee