Did you try PM-ing h2o about this.... He's not reading this FOS thread you know
You can also try reinstalling one of the rigs to see what happens. Seems like this issue is quite isolated so it might be a particular setup that can cause it.
Alright, I am done dumping my money into a black hole.
I hope that's enough information to fix this crazy-ass bug.
Let me know if you fix it?