indeed, Vsig has nothing to do with what you dscribe.
-what H8000 models you have (H8000/H8000A/H8000FW)?
-what is the OS version loaded on them? We only supprt the latest version 5.2
-for any question related to audio and clock we need a full detailed description of the audio routing of inputs/DSPs/outputs/used sources and clocking settings. Depending on which H8000 you own, there are different termination aspects. You may want to check the Word Clock Termination technote on the Eventide website (under Support click on Knowledgebase > Harmonizers>Difgital Interfaces to find it).
You may also want o execute a clear setup on both units as they have been off for a while. This may help getting the audio back on the first machine.