Max 6 colormode uyvy texture trouble

Hello, I've isolated a problem with the way Max 6 is displaying (or not..) images with uyvy colormode in OpenGL on a videoplane. The trouble is that the texture displays with much distortion with two versions of the image offset and interlaced on the videoplane.

The strange thing is that reading the same file a second time will usually, but not always, display correctly. Even stranger... if attributes of the window displaying the the rendering context are changed a correctly displaying image will degrade into the broken image again. Please see the attached patch.

Thanks,

Kenneth.

MacBook Pro
10.6.8
NVIDIA GeForce 9400M