I found this evening that the Gnucash.app in Gnucash-Intel-3.1-1.dmg was missing
a line in the environment file so that it wasn't able to use the SQL
backend. I've fixed the problem and uploaded a replacement,
Gnucash-Intel-3.1-2.dmg.
The sha-256 signature is
71d06ea408302defacf08dcc8343ade86eeb2298b8b33e75a6e240754c2faf71.
If you'd rather do minor surgery on GnuCash instead of downloading a new
dmg, select GnuCash in Finder and control-(or right-)click on it. Select
"Show Package Contents" from the context menu, then navigate to
Contents/Resources/etc/gnucash. Select 'environment', control-(or
right-)click on it, and select "Open With...". Pick an editor,
TextEdit will do fine.
Go to the end of the file and add the line
GNC_DBD_DIR={SYS_LIB}/dbd
save as plain text and quit.
Regards,
John Ralls