A user is unable to see certain pages in Internet Explorer 7,8, or 9, but otherwise show up ok in other browsers and IE 10.
This can be caused by two issues.
One cause is that you need to add this line of code in the Meta Tags section of the Page Wrapper: <meta http-equiv="X-UA-Compatible" content="IE=Edge" />
The other cause of this can be if the HTML was copied from Microsoft Word. If this is the case there is a lot of extraneous code that gets added, and Internet Explorer will try to render it and fail. To fix this, remove the extraneous code from the HTML.