With PL 4 and 5 on Mac, I find the following behaviour:
When I set PL 4 and 5 to NOT import and export settings automatically, the Pick/Reject lamps turn on and off as expected when I tell PL4 to export and PL5 to import settings (using the file menu).
When I set either PL to import and export settings automatically, the Pick/Reject lamps DO NOT change as expected, even if I tell PL5 to import settings (using the file menu).
This looks like PL4 is NOT updating the Pick/Reject entry in the sidecar, even if set to do so automatically.