Configure Screen reordering fields fails

/secure/admin/ConfigureFieldScreen.jspa

This view fails, fields cannot be reordered. This might be because of custom fields (we were trying to reorder custom fields). Tried in Firefox and Chrome browsers both. Once you grab onto the handler, the HTML gets broken and JavaScript breaks on the page.

Throws the error in JavaScript (console):

5.1.6 batch.js:31
Your are trying to create a ToggleBlock with selector '.twixi'.One already exists with this trigger so has been ignored. batch.js:3307
Your are trying to create a ToggleBlock with selector '.toggle-trigger'.One already exists with this trigger so has been ignored. batch.js:3307
Your are trying to create a ToggleBlock with selector '.toggle-trigger'.One already exists with this trigger so has been ignored. batch.js:3307
JETI javascript loaded batch.js:31
jeti admin script loaded batch.js:31
10
Uncaught TypeError: Cannot read property 'model' of undefined