When the "Report to moderator" feature is used, the dialog isn't closing.
Once the button is pressed, the information is posted to https://www.element14.com/community/message-abuse.jspa, but it fails with 403 - Unauthorized. The button remains grayed out after this and the dialog remains open.
Fortunately the moderation request came through. Thanks for reporting.
Errors like this sometimes come up when content has been reported while you're reporting it.