I really appreciate the time spent trying to help me with the issue. Here is what I did.The house has been around a while and there are several cables that are not used and it has been through a few installations and upgrades. I traced the cable from each receiver to the LNB. The front receiver ran out to a grounding block on the side of the house, through one port, and up to one side of the LNB. The back receiver ran out bypassing the grounding block and straight up to the LNB. An abandoned, dangling cable by the dish ran down to the other port of the grounding block. I reconnected that cable to the LNB and connected the cable from the back receiver to that port of the grounding block...restoring a previous installation. Both worked but the original issue persisted. I removed the grounding block from the path, connecting each cable set straight to each other with a male/male connector and the problem was resolved. A quick trip to Lowe's for a new two-port grounding block and we are back in business and properly grounded. I can only assume that something was wrong with the grounding block. It also looks to me like a previous service call had determined the cable (LNB to Ground) was bad since it was just dangling by the dish. At any rate the problem is solved and I am indeed grateful for the help, and also grateful for finding this forum in case we have issues in the future.
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