I used a Twin LNB with built-in switch for my Dish setup and a Monster HTS800 with no problems. Now I don't currently have switches with my new DirecTV setup so I can't compare.

Maybe if you outlined the precise connections, somebody here or at another forum could help. dbsforums.com is apparently back up again. There are more knowledgeable people frequenting that place than any other I know. Or maybe Panamax could help.