Kristarella,
Thank you for your help! What you said helped me to figure out what I did to mess up Exifography and how to repair the damage. So, in order to help others who might run into this issue, let me give a brief rundown of the issue and how to fix it.
If you are creating, or editing, a post and use the Media Upload feature to insert an image into your post, Exifography will pull the exif information and add it to the end of your post. If you add multiple images to a single post, Exifography will only pull the exif info for the ALPHABETICALLY or NUMERICALLY first image. For me, setting the featured image did NOT change the exif info displayed in the post.
But this can lead to a problem if you’re scheduling posts for the future.
The problem arises if you are creating or editing a single post but use the Media Upload feature from WITHIN THAT POST to upload images for different posts. For example (and in my specific case) I was creating a post for the Sunset photo and decided to also upload the photo for the following day’s post (Hula Girls). So, using the Media Upload button from within the Sunset post, I uploaded BOTH the Hula Girl AND the Sunset photos. So, even though I only included the Sunset photo in the Sunset post itself, Exifography thought BOTH images were part of the post and pulled the exif info from the alphabetically first image that I uploaded, in this case Hula Girls. And the following day, when the Hula Girls post was posted to the site, Exifography DIDN’T attach any exif information to the post because it thought the Hula Girls photo was already included in the Sunset post.
All of which meant that the Sunset post had the Hula Girl’s exif information, and the Hula girls post had NO exif info displayed at all.
The fix was pretty simple. Remove both photos from the Media Library and the posts, re-upload the images and then re-link them into their respective posts. Once I did that everything worked perfectly again.
Hope this helps people in the future.