I have a VS Extreme with a Dish 500 -Dish Pro-Twin LNB. No switches involved since Dish 500 w/DP Dual Lnb has already a built-in switch.
When I move my VS to a different room, I get all channels with full sig & q strength. When I move back my VS to its orig location, signal diminishes and S & Q on some channels are just way down and I can barely get any channels on some TPs.
Definitely not a dish problem...Not sure where to troubleshoot this to get good results on VS in its orig location.
Sounds like it has to be the cable or one output from your lnb. swap the cables at the lnb and see if the problem swaps rooms too, if it does, u have a bad cable. if not u have a bad lnb