THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
The "security and nonsecure items" message in IE is being caused by an issue in Dojo. For more, see the discussion on the WebWork forum.
There is a workaround available from the Dojo mailng list.
In short, line 79 in dojo/src/storage/browser.js
storeParts.push('codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0"');
should be replaced with
storeParts.push('codebase="https://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0"');
Also try to search dojo.js and see if the following exists
_607.push("\tcodebase=\"http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0\"");
if it does should be replaced with
_607.push("\tcodebase=\"https://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0\"");