When using Martin LCS control software and a Martin DVI Buffer Box in an LC Video Panel installation, you must use Martin DVI Splitters (distribution amplifiers) as these are modified to handle the special control signals on pins 6 and 7. The LC Series user manual mentions this on page 15.

Ordinary DVI splitters (distribution amplifiers) will work for distributing the video signal but they will NOT enable you to use the tools in the LCS control software or use the Genlock functionality.