Zimbra Desktop 7.1.4 GA (Build 11299) on MacBook Pro.
When I scroll down the list of emails and try to click on one, ZD often jumps back to the top of the list (without displaying the email), and I have to scroll down and find the email again. Usually it doesn't repeat the behaviour second time round and I am able to view the email. It's a highly irritating bug.
I'm not sure, but I think it might happen mainly the first time after I have gone to another folder in my mailbox, including the Inbox when I first run ZD or if I click back to the Inbox from another folder.