A simple way to diagnose whether you are being impacted by the “Trusted Sites” is to view your organisation chart in Chrome. If you can see the profile pictures in Chrome but not in Internet Explorer then “Trusted Sites” is usually the cause.
You can access an artile written by Microsoft that describes the issue in more by clicking here.
To view your trusted sites open “Internet Explorer Options” and then select the “Security” tab.
Select, “Trusted Sites” and then clicking “Sites” will display a list of the current “Trusted Sites”.
This should be either completely empty OR contain the following URL’s
Certain Microsoft tools will automatically add items to Trusted Sites ( OneDrive, the Excel to SharePoint List upload tool, Skype for Business ).
Alternatively, if using the SharePoint Picture Source, set the source to be SharePoint (Cross Domain).