There have been several cases observed where older DirectTV sources (H24) are not able to function correctly with 7 Series HDMI designs.
This is only seen in very old versions of the DirectTV source and with 7 Series devices. This is not seen with newer FPGAs.
This is a known issue and no solution is currently available.
We believe that this is due to CPLL/QPLL limitations in 7 Series coupled with a very noisy TMDS clock from the DirectTV source.