Thank you, Brian. I would never dream of asking you to make a such test for me. 谢谢!
After your confirmation, I did some tests in my environment again. Finally, I found the cause.
I had installed a web server certificate that uses domain name as common name. When I accessed the admin app, I used https://Webserver's IP. In this case, IE will display a caution, so it does hold back the downloading of the image.
I modified the javascript in 17F0BE3EA5641F07D7577BBE62732065.cache.html to avoid the problem above-mentioned. It worked fine now.
Thank you again for your nice help.
After your confirmation, I did some tests in my environment again. Finally, I found the cause.
I had installed a web server certificate that uses domain name as common name. When I accessed the admin app, I used https://Webserver's IP. In this case, IE will display a caution, so it does hold back the downloading of the image.
I modified the javascript in 17F0BE3EA5641F07D7577BBE62732065.cache.html to avoid the problem above-mentioned. It worked fine now.
Thank you again for your nice help.