Cannot expand collapsed field sets and thus Unable to Create Locations for New Content Type

Upgrade to 5.14 had no impact on this behaviour. I've attached a screen shot of the problem.

Making some progress.

Checking my Java Error console find the following error message:

$(fieldset).find('div.gmap-map')[0].id is undefined
http://www.anchorageworld.com/modules/gmap_addons/location_quickgeocode/location_quickgeocode.js

Comment #2 has nothing to do with the issue. (Although I supposed one should define the variables for good form).

Checking the page source shows that all of the necessary HTML has been generated. It seems there is a problem with the collapsible field set. Here is the start of the output:

<fieldset class=" collapsible"><legend>Locative information</legend><fieldset class=" collapsible collapsed"><legend>Number of locations</legend><div class="form-item" id="edit-location-settings-multiple-min-wrapper">
 <label for="edit-location-settings-multiple-min">Minimum number of locations: </label>

Oddly enough I get this behaviour for all of the modules (fivestar & sitemap) also output collapsible collapsed field classes and they do not appear properly.

Using Firefox or Explorer. I've no idea where I'm going to go next, perhaps modifying the location.module to set collapsible to FALSE everywhere to see what happens.

Ok so I manually edited the location module and manually set all of the fields with collapsible properties in function location_settings to be FALSE. This solved my problem, but is a complete hack. I still don't know the root cause of the problem.