Does Video Input have an Alpha Blend option?

I'm using the "vdc5_vdec_smp1" sample from the CMSIS BSP app note on the RSK board.  I've modified it to support digital input using the 16-bit YCbCr422 format.

My code works mostly as expected - but the video coming in has a distinct green hue to it.  As far as we can tell, the input pins are connected properly - which makes me wonder if there's some alpha blend option that I'm missing.

This is not a problem with my graphics layer.  I make sure to use transparent pixels there - and when I switch my code back to analog video input using the RCA jack, the video colors are correct.

Any insights would be appreciated.

Thanks!