Opening notices is an old bug. The notices are good for a couple of hours. So, if you see one pop and click it, it will almost always open as expected. Also, a landmark (BUG-10498) in a notice will work while it is fresh. Say a notice gets sent at 10 AM and I login at 6 PM, 8 hours later, chances are good the notice attachments will not open (BUG-6542) and a Landmark will not work. It is a server thing allowing the information to time out.
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