For security reasons, framing not allowed - error in IE7

[marklsanders]

http://mirs.org.uk/dev/test.html

This is my test page - it contains a VERY simple bootstrap 3 template, with container and two columns, span 6 each. There is a link to a bootstrap-ie7.css stylesheet that contains a reference boxsizing.htc.

When I load this page in IE7 - with the link to the bootstrap-ie7.css file included - the page loads, then I get a series of error messages reading "For security reasons, framing is not allowed'. I get 3 errors, then the page displays - but not correctly: the last column always wraps. It does this on the very simple templae and other more complex layouts.

If I edit the bootstrap-ie7.css file to break the link to the boxsizing.htc file, this problem does not occur.

Can anyone shed any light on this, please?

mark