A user pointed out to me that she couldn't edit her post and wanted to correct a spelling error. I had made a wrong entry in the Usergroup config, so I set "Edit post by self" to Allow.
I tested the user's permissions and her posts still do not show the 'edit' option. I checked the Node settings and the Category setting for that node and found them set to Allow.
All entries in user's individual record were set to Default. I changed them to Allow, except for the Moderator settings.
I can't swear that something changed, but I was pretty sure everything was working properly...possibly before the latest upgrade.
But for now, I am unable to allow users in the Registered group to edit their posts. Any ideas?