What version 401? What exactly are the lights doing? I can't find the "goes nutty" light. You have Power, HomePlug, and Ethernet.
I worked with a PLC startup company for several years, and funny thing we used ZyXel for functions not in our box.
The thing's they don't broadcast are:
1 - The FCC limits the power that can be used because of possible ham radio interference, even though the frequencies are masked out. 2 - If the outlets your devices are plugged into are not on the same phase, then the coupling actually occurs as a radio transmission inside of the circuit breaker panel. 3 - If your house is wired anything like this outlet --- panel --- panel --- panel - outlet
the signal will even be weaker.
Don't get me wrong, I like PLC, but I was never impressed with Intellon, though I never worked on the AV products, so maybe they worked the bugs out.
The commercial product we produced was quite impressive. I could walk into a 150 room hotel (Comfort Inn, Holiday Inn Express, etc) in the morning and by 5 o'clock I could have all rooms up and running on the internet.