landscape view shrinks background to left 2/3 of screen

[laxtwentyone]

I have an Acer Iconia a510 and haven't had any problems with it until yesterday. I changed the wallpaper and now any image I set as the background looks fine in portrait mode, but is reduced to fit only the left 2/3 of the screen when I rotate to landscape. If I use a live wallpaper it works fine, but it messes up with anything else. The only thing I can possibly see as a cause is I tried to set the wallpaper from an image inside of the Perfect Viewer app, but i have no idea why that would cause it to not work when set from outside the app. If anyone has any ideas on how to fix this, please help. Thanks.