This can be caused by enhanced security in recent web browser versions. You need to set your web browser to allow downloading of insecure content.
For example in Chrome browse to amazon.com (or your national site), right click the lock icon to the left of the URL and select Site Settings. From the screen that opens scroll to "Insecure content" and change the setting to "Allow".
(Added: It might also be related to blockers as mentioned above.)
Last edited by jhowell; 07-15-2021 at 12:09 PM.
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