I don't know what option I changed, but in new databases, the combo boxes do not begin to auto fill as you type in the field.  However, I can open previous databases and the combo boxes will auto-fill.  The caveat is that if I copy the combo box from the old database to a new database, it then does not auto fill!  

I read in the Microsoft Forums that you cannot change Access back to it's factory default settings or remove and re-install Access to eliminate this issue.  Some of the options are written into the actual database that you created instead of a registry key of the computer.

I've only seen a few videos in which Richard has discussed changing various options in Access, but maybe he can address this issue as to what options are written into the registry and which are written in the database file that is created.