I've had this problem with mirrored bitmaps not displaying as they should in the viewport.
I have no problem with tiled bitmaps. It looks as if the mirrored bitmap is displaying in the viewport at 200% scale of the final render.
I am using a NVIDIA Quadro K2000 with latest driver installed.
Has anyone else come across this problem? Graphics Card prob?
Please refer to attached image (benchtop marble).
Graeme