This is a suggested sequence of actions to help with the current problem with the White Rabbit timestamp distribution. Test the system between each intervention. If a test provides an answer to the problem then proceed accordingly rather than continue with the suggestions.

• Please sketch the current MACB wiring.
• Unplug and replug the connectors of the VETAR HDMI connecting cable. If possible clean the pcb and cable HDMI connectors with contact cleaner.
• Disconnect the VETAR and connect the Emulator. If the clocks are not correct then at the Local and Waveform control page change the entry for LMK03200 control register at offset 5 to 0xB. If clocks are now ok then repeat for all the FEEs. Be aware that this value will be set back to 0x1B during SETUP. If the Emulator fails then continue with VETAR and setting 0x1B.
• Connect one or more FEE64 to the base MACB.
• Change the base MACB and repeat the test above.
• Connect a FEE to the VETAR direct. 

I am at present unable to advise further. However should there be more then I will update this entry.