vyacheslav

Thanks guys, but I'm thinking maybe I have a defective switch(es) somehow? I hooked up the new switches EXACTLY as the old ones were...

Yes. Single pole switches only have two screws/terminals for hookups. These have three.

There is only one switch in each box, single gang. No other devices other than the single switch per box. Three wires coming into each...

Thanks for the reply. On Switch A, the power line is Black (top by itself) and the conductors are Red and Black. I hooked them back up...

Greetings, I have a 1st floor small bedroom/office which has two doorways (from front hall and a from a smaller hall to the kitchen)...

Holy Moly! I just checked back in on this thread. Thank you SO MUCH for all the effort and time in making that diagram, Paul. You...