Hi Ed! Thanks for the report.
I believe your issue was that you entered "5000A" -- "at or above 5000ft". Therefore, the VNAV solver starts at your most restrictive constraint (the @2100ft one for CF27), then projects the 3° profile back. 5000A doesn't require the solver to put you at 5000ft, but anywhere above that, so it won't show in the VNAV window, because VNAV is not aiming for 5000ft, just checking that whatever profile it comes up with passes SUM above 5000ft.
If you want to make sure that VNAV gets to SUM at 5000ft, you can just enter "5000" as the constraint, and once you do so it will show up in the VNAV window. I hope that makes sense!