I have been having this error for like past 3 months. Every time I try to open a container or sending my item into guild bank/bank by pressing "E". Usually I just reloadui every time to fix it. But lately I have been playing more and I have been facing this problem more and more. Would any of the addon authors can help me out with identifying the issue and fix it for me?
http://imgur.com/a/DGUcs