Where's my field? button not working when creating Epics from an Agile Board

Summary

When creating an Epic from the Backlog view, the Where is my field? button doesn't work. When creating the Epic from the Create button in the top navigation bar, this button works correctly.

Environment

• JIRA 6.4.11
• JIRA Agile 6.7.11

Steps to Reproduce

1. Create a Scrum board
2. Navigate to the Backlog tab
3. Expand the Epics panel on the left
4. Select Create Epic » Configure Fields » Where is my field?

Expected Results

The Where is my field? dialog would appear.

Actual Results

• Nothing happens, just as if the button was never clicked, or
• A JavaScript error is displayed.

You can watch this behavior in the video attached: [^epic_fail.mov]