You are unable to use the vCloud Connector UI from vSphere Client.

When you click the vCloud Connector icon in vSphere Client, the vCloud Connector UI appears but you are unable to click any objects in it or perform any actions.

Check your Internet Explorer security settings. vSphere Client uses Internet Explorer security and privacy settings.

Set your settings at Medium High or below. This setting allows cookies and Javascript, both of which are necessary for the plug-in to work.