Problem:

The blue bar (Chrome Control) at the top of the page is not being displayed and Internet Explorer shows up the notification "Only secure content is displayed".

Possible Reason:

The Chrome Control loads content from SharePoint and from Collaboration Manager. If secure (https) and non-secure (http) content is being loaded, then Internet Explorer will prevent the non-secure (http) data to be displayed.

For more information see: https://support.microsoft.com/en-us/kb/2625928

Solution:

You have to tell Internet Explorer to always display mixed content.

1. Open the "Internet options", then click the "Security" tab:

2. With the Internet zone selected, click the Custom Level:

3. In the Settings box, scroll down to the Miscellaneous section, and under "Display mixed content" choose "Enable":