Some javascript which lives in jira-global.js attempts to keep track of the position of popup windows and store coordinates and size of th epopup in a cookie. Whenver the same popup is opened it attempts to grab these values from the cookie and reposition / resize itself. However under Internet Explorer this code doesnt work. Opened windows (which are typically done as window.open without any top / left coordinates) will continue to travel in a diagonal direction until they are out of view of the window. This is quite annoying to the user.