gnome3 crash at login

[dave perry]

The following gnome3 crash occurs when attempting to log in to my 
personal account.  Gnome3 presents the log-in screen with my user name 
selected.  When I enter my password and press enter, the crash occurs.

On screen I see a frowning monitor and

Oh no!  Something has gone wrong.

A problem has occurred and the system can't recover.
Please log out and try again.

Since I can still log in to other accounts, I assume there is something 
causing the crash in one of the hidden files or folders.  This began to 
happen a few weeks ago after a "yum update".

Where to begin to isolate what changed?