[GNC] restoration from backup not working

[Eliot Rosenbloom]

Hey - I want to get rid of the entries I did today (1/2/19) and revert 
back to my last backup (12/20/18).  When I double click on

gnu-P-4.gnucash.20181220083434.gnucash , however,

what opens (judging from the name at the top of the main window) is

gnu-P-4.gnucash.20161010002912.gnucash ,

which is the OLDEST file in the folder.

I tried this several times.  What am I doing wrong?

I'm using macOS 10.14.2 , and I just upgraded from gnucash 2.6.19 to 
3.4.1   (I forgot to quit the dbus-daemon , if that is still 
recommended.  Just now I looked in ActivityMonitor and do not see it.)

Thanks!!

Eliot