IE8: Security Warning with Editor (https/SSL)

[BigzampanoXXl]

Hello,

I have a problem with the Kendo UI Editor displaying a security alert when loading the page in IE 8. Our MVC applications runs with https (SSL) . When I load a page with the Kendo UI Editor on it it displays the following security alert popup:

Do you want to view only the webpage content that was delivered securely?
(also see the attached screenshot. BTW, I replaced the german alert popup with the proper english one on the screenshot. I think that is more helpful.)

The SSL problem occured on other Kendo UI controls also, but I could fix them all by replacing all the HTTP urls in the CSS-stylesheets I used with local urls. But I cannot get the Editor working without displaying the popup.
Also it is not a solution for our IE 8 clients to make any changes to the IE 8 settings.

There must be still any http resources in the Editor that causes the alert to popup. Do you have any ideas what still causes the security alert? Any response is welcome. Thanks.

EDIT:
I forgot to mention that I also used Fiddler to trace the traffic. Only https traffic was shown in Fiddler.
After some more investigation I could track down the problems. It seeems the Combo Boxes in the Editor toolbar cause the problems. Take a look at the attached screenshot again. You will notice, that the content of the ComboBoxes have not been loaded yet (because it is blocked by the IE 8 security popup). After clicking on "Yes" or "No" (it does not matter which one I click) it populates the content of the ComboBoxes.

To test, I removed all the Toolbar entries (@(Html.Kendo().Editor().Tools(m => m.Clear()) and the security popup is not displayed anymore. So it has defnitly something to do with the toolbar content/images.

Does that help you in any way to give me some ideas/hints what I can do to get rid of the popup and also display the toolbar?

[Alex Gyoshev]

Hello Dietmar,

We are currently investigating the issue; we have reason to believe that it is caused by the color pickers. I will follow up once the issue is resolved -- until then. you can disable the problematic tools by configuring the toolbar.

Regards,
Alex Gyoshev
Telerik

[Alex Gyoshev]

Hello Dietmar,

After trying out different scenarios, we could not reproduce the problem -- the popup warning never showed up. Can you please provide more details about the environment? (in essence: the used Kendo UI version, security settings different than the default ones, which tools cause the problem)

Regards,
Alex Gyoshev
Telerik