Editing posts calls error in IE

I recently updated to 2.7.1, and after going through all the steps, etc. It seems now that I am unable to edit any of my older posts.

I see the page start to load with the new dashboard (at least to me) and then I get the following error:

Internet Explorer cannot open the internet site: (blog address)
Operation aborted.

Anyone got any ideas as to what it might be?

Thanks in advance.

EDIT: I get this error when trying to add new posts and pages as well.

J