All of a sudden, the 'add gadget' dialog fails to load in our Jira environment (Jira 4.3). When clicking the Add gadget link, the spinner shows up but the dialog is never shown.
The log files of jira show nothing in particular that I could relate to this issue. But in the browser (Chrome) I can see that the following file fails to load: rest/config/1.0/directory.json
Does anybody have a clue what can be wrong?