Sorry - thought I had this figured out, but I don't. Turns out DJ-ImageSlider wasn't to blame. It was just the most visible element to break on the front end when I renamed the chosen.js files. And as you pointed out, it broke elements of the back end.

I know this isn't a CB problem, but I'm at a loss and hoping you can suggest some hints on how to figure it out.

- I tried grep all the .php files on my site for "chosen.jquery.js". Nothing found (but not a big surprise).
- Grepped for "chosen." (added a period). Found the following:
* /administrator/components/com_admin/views/profile/tmpl/edit.php
* /administrator/components/com_templates/views/style/tmpl/edit_options.php
* /components/com_config/view/templates/tmpl/default_options.php
* /components/com_joomgallery/models/favourites.php
* /layouts/joomla/html/formbehavior/ajaxchosen.php
* /layouts/joomla/html/formbehavior/chosen.php
* /libraries/cms/html/number.php
These are Joomla core files with the exception of favourites.php, and all that had was a comment with the word "chosen" at the end ("// The list of favourites is filtered now, so that only valid images are chosen.").
- I set up a new instance of Joomla and installed all of my components and plugins one at a time until they were all installed (I might have missed some minor plugins), but I couldn't get it to fail.

Any recommendations on how to determine what is loading Chosen?

Thanks