Here is a public acknowledgement of my idiocy as well as my solution:

Make sure that when you are putting your settings into Drupal, your dev isn't using something other than the Default display settings. I was entering the Pro settings in the wrong display tab.

*bows head in shame*

Thank you for your help and patience, and for a great library!

I have put them there, as well as in the regular settings...
http://devanimals.sandiegozoo.org/sites/all/libraries/juicebox/juicebox_pro_settings.png
Sorry to be a pain in the keister, but if you have any other advice, I would be so grateful!

I am adding them to the field display settings for that content type... Is this wrong? The options appear there...

Oh, jeez. I am sorry - I put in the live site rather than the dev one:
http://devanimals.sandiegozoo.org/animals/reindeer
And I have now added the three lines above to the Pro Options area, but it is still not working...

Thank you - sorry I am a ditz.

I am using Juicebox on a Drupal 7 install via the Juicebox HTML5 Responsive Image Galleries module. I am trying to get it to show up without thumbs or thumb button, and to do so, I have un-set thumb button via the module UI, and have added the following to the Pro manual config section:
showThumbsOnLoad="FALSE"
showSmallThumbsOnLoad="FALSE"
It does not help, however. I am getting Juicebox, but not able to control it at all it seems. I have a request in via the module support forum:
https://www.drupal.org/node/2604504
If anyone here has any input, however, I would be most grateful. We do have the 5-license Pro version...

Thank you so much!
Kristin Nielsen
http://animals.sandiegozoo.org/animals/reindeer