Scrolling Background Repeats Last Column of Pixels Instead of Entire Image

Has anyone ever seen this? I am using texture offset (right to left) on a Quad to create a scrolling background for a 2D side-scroller. But instead of restarting the texture, the same column of pixels repeats for the duration of the texture width and then snaps back to using the whole image and then repeats the column of pixels again. It looks like the texture is stretched for whole the width. The project and code work correctly on other computers, but not on this one. I’m convinced some setting has been turned on or off but can’t find it.