Preview HTML and MHT -- prevent IE content blocking?

Hi forum,

often I save Web pages as MHT file (one file that contains the entire web page including images).

When previewing these files in the Opus preview pane (using Internet Explorer/ActiveX), sometimes Images or iframe content is not displayed, and instead IE shows a banner saying:

[quote]Some pictures have been blocked to help prevent the sender from identifying your computer. Open this item to view the pictures[/quote](see screenshot with the respective blue banner at the top, in german).

The same happens if the file is saved as "HTML, complete" instead of as MHT.

I have already enabled the IE security option "allow active content to run in files on my computer":

Any idea what else could be done to enable proper MHT and HTML preview in Opus again?

Regards David.P