I have the above setup wired up. Here is a picture of the actual wiring of the right gang box.
But, the switches are clearly not wired correctly. What I am seeing when I test the switches is:
1 - the switch in the far left of my diagram
2 - the switch in the middle of my diagram
3 - the switch in the far right of my diagram
A - light on the left in my diagram
B - light on the right in my diagram
Looking at these results, light A is only on if the two 3-way switches are in the same configuration (both up or both down), regardless of how the single pole switch is configured. Light B is only on if the two 3-way switches are in the same configuration (both up or both down) AND the single pole switch is in the Up position.
I even climbed up into the attic to make sure there aren't any wires connecting the 2 lights. I can't figure out what in the world is causing these results. I especially can't understand how the second light (the one connected to the single pole switch) is being affected by the other switches.