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John,

The error appears to be caused by a change in signal mast placement.

The destination mast is before the source mast so the logic searches around the entire layout and eventually has the error.

If you delete the SML and add the next two destination masts in the direction of travel. ?For some reason, Discover does not work but you can enable Layout Editor/Blocks/Turnouts and that works.

I suspect this is a side effect of replacing crossovers with turnout pairs. ?I will have to some more research tomorrow.

On an unrelated note, I notice you have some crossovers acting as a double crossover with two blocks. ?The causes SML problems since there can only be one direct connection between two blocks. ?These require three blocks. ?For example, LB Tower and Kimball Ave.

Dave Sand