@ giglionews
It sounds as if there is a fatal javascript error on the page. When this happens it is nearly 100% of the time due to a plugin/or theme not limiting its javascript to its own admin pages.
Open the page in Chrome, hit the F12 key and then click the Console tab.
All javascripts errors will be listed here.
If you mouseover/hover over the file name in the far right of the row, the file path will be shown. This file path very often gives a strong hint as to which plugin is causing the error.
If it doesn’t, you’ll have to deactivate all plugins except Connections and activate each one individually until the issue reoccurs. When it does the last plugin activateds is the cause.
Hope that helps!