I went back and re-read your direction.  I entered the the 18b and 18c data on the M-1 worksheet in the 'Other permanent items (income)' and 'Other permanent items (expenses)' sections.  The data populated on the 1065 page 4, but still not on the Schedule M-1.

I figured out what the issue was - in the 'Schedule M-3 Smart Worksheet' (on the Schedule M-3), I had 'Yes' checked for "Calculate Schedule M-3, pages 2 & 3".  When I check 'No', the 'Schedule M-1 Items Worksheet' data populated the 'Schedule M-1 Smart Worksheet' on the Schedule M-1.  I then checked the "Check box to enter line E on Schedule M-1, line 1", and the Net Income (Loss) Per Books line in Schedule M-1 then populated.  I'm good to go now - thanks!