If you can answer this question, you're a better man than me!
The new signalling system gives a false reading for one block that has a turnout in the middle of the block that goes to the logging railroad.
The red highlight indicates a train present in this block. This works correctly when to the right of the turnout.
When the train is left of the turnout, another block that is about 100' away is highlighted and the block with the train goes out.
I have two feeds directly from the main control panel to each side of the turnout that feeds this block. I removed the feed to the left of the turnout (the problem feed) and ran a jumper wire to both sides of the turnout and all works correctly.
I pulled out the feeder wire to the left of the turnout and it only goes to the left of the turnout and no where else. In essence, I replaced two feeders with one plus a jumper wire. The only thing I can think of is, some how, this problem feeder was touching the other blocks feeder wire, but I've got all the feeders routed together under the layout! For my old PFM sound system, I used both wires for each rail side and the wire is metal sheathed.