Sometimes the Refresh button in various pages does not function when you click it.
Work around:
Log out from iManager.
Clear the browser’s cache.
For Internet Explorer,
Click Tools > Internet Options. The Internet Options dialog box is displayed.
Under the General tab, under Browsing history, click Delete.
For Firefox,
Press Alt + F > .Select History and click Clear Recent History.
Select Cache and click Clear Now.
Log in to iManager.