"waiting for sd card" after update today

Navigator was working fine until this morning.   This morning I accepted the latest update from the Play Store.  Now Navigator won't start up, saying  "waiting for sd card".

No changes to Navigator except for the update.

I'm running Navigator on an old Samsung Galaxy Tab Pro running Android 5 (cyanogenmod 12.1).

No other app has problems with the sd card.  Navigator had no problem until the update was installed.

Any suggestions?

Navigator is my most essential app.  It's a fine piece of software.

thanks,
Daniel