There is a JavaScript error on neworderempty.pl which shows up in the console: $.timepicker is undefined git blame points to Bug 25133, "Fix time part of due date for 12hr"
(In reply to Owen Leonard from comment #0) > There is a JavaScript error on neworderempty.pl Correction: The problem appears to be on any page with a datepicker.
Seen the last follow-up on bug 25133?
The last follow-up appears to fix the issue for me - marking duplicate. *** This bug has been marked as a duplicate of bug 25133 ***