Apparently the problem lies in the fact that CA site was browsed with IE 11. To fix this problem, site has to be added to compatibility view list. In Internet Explorer 11 open Tools menu and choose Compatibility View Settings menu item while browsing CA site. The following window should open:
Click the Add button. Window should now look like this:
Close the window and voila, now ECB should be rendered. Notice how grid lines are added to the list: