From the IE menu bar, hit "Tools" und select "Internet Options".

Now a window will appear.

Move the adjustment lever to "Medium" oder "Medium-high". You can also use the button "Default" if security level "Medium" is not preselected.

(Additional Info:

To accomplish the correct setting manually, hit the button "Advanced". In the following window tick "Override automatic cookie handling" as well as "Accept" under "First-party cookies" and "Always allow session cookies". Note that the precedingly mentioned steps are sufficient to get www.single.am to work.)

Now close the window by hitting "OK" and restart the Internet Explorer.

Done!