"Do you want to view only the webpage content that was delivered securely?"
Button options are "more info, yes, and no". There is no checkbox for "do not ask me again." Most users will check "yes" because prior versions of IE used "yes" to indicate "yes, show me everything". But now it's different, and "no" is the button that should be selected if the reader wants to see all objects. He will undoubtedly select "yes" from time to time and receive an incomplete or erroneously displayed page.
Read the text of the message above once more, and you'll see what I mean.
This is a nuisance because it happens on every page in Coffeecup's very own forum (whenever you've logged on) until you go and change your Internet Explorer settings. We all have to deal with end-users from time to time, and we know that not every IE8 user will have even the slightest inkling on how to do this!
I believe that the correct thing to do here is to fix the Coffeecup forum to avoid using mixed-mode objects after people log on.
Here's a link to a site that describes the problem and how to fix it on your web site.
I've enabled mixed-mode viewing in my own IE8 preferences, but...that's not really a long-term correct solution, as noted by that same article and some of the reader comments that follow it.
Intel i9 (workstation) and i9 (laptop). Gobs of RAM and acres of SSD space on both machines.