@ The_Gear : Problem wasn't Fences, it was instead WindowsFX. I disabled the WindowsFX service in the windows 'service' manager (disabled auto-start), and the computer boots and operates with-out any problem (Fences and ObjectDock still enabled).
I have 2 High End Video Cards (NVidia, with Maxwell GPUs, NVidia's latest architecture), and I suspect that WindowsFX is just not that stable, yet, with those very recent GPU architectures.
That's ok, for now, I purchased Object-Desktop, but not specifically for the WindowsFX, so maybe I'll give WindowsFX a try again in the future, after some next revisions on it.
Thanks for very quick response, when that wasn't even a support ticket that I generated (impressive service).