Problem viewing Sitemap Overlay in IE7 & IE8

I've noticed that when using the Sitemap Overlay for selecting a page (for example, the 'Image' block) in IE7 and IE8, the sitemap overlay will not work. Instead, an unstyled popup shows a sitemap with 'Unapproved' and 'Approved' filter options.

I've installed a fresh version of 5.5.1 on a test server of ours and I can see it happening there also.

Any ideas?

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JohntheFish replied on at Permalink Reply
Bug reporting and tracking at:
Mousetrap replied on at Permalink Reply
Thanks John, I've submitted a bug report.

Using an old site of ours, the Sitemap overlay works fine in 5.4.2, so I'm guessing it's something to do with 5.5(.1)?