Do not use the 
button, the Close option in the File menu, or the Alt + F4 shortcut to close the web browser. To close Device Manager - Storage Navigator, click Logout or File > Close in the Device Manager - Storage Navigator menu.
Web browser restrictions while using Device Manager - Storage Navigator
When logged in to Device Manager - Storage Navigator, do not use web browser menus, shortcuts, or other browser options as described here:
If you use Back, Next, or web browser shortcut keys such as F5 and Esc, you will be logged out of Device Manager - Storage Navigator. Any settings you made during the session will be lost.
Do not use the button, the Close option in the File menu, or the Alt + F4 shortcut to close the web browser. To close Device Manager - Storage Navigator, click Logout or File > Close in the Device Manager - Storage Navigator menu.
Do not change the web browser settings such as Tools > Folder options in Internet Explorer. If you do so and see unexpected results, close the web browser and log in to Device Manager - Storage Navigator again.
Do not disable Adobe Flash Player because Adobe Flash Player is necessary for Device Manager - Storage Navigator and works as an add-on to a web browser. If you use Internet Explorer, do not change the settings in Tools > Manage Add-ons.
Do not use the following web browser functions: character encoding, text size, the zoom function, the Ctrl + F (search), Ctrl + A (select all).
Use only the Tab key to move the focus to the Adobe Flash Player window. If you use Shift + Tab to move the focus in reverse, the focus may not move from the web browser to the Adobe Flash Player.