IE 8 - Table cell drag & select not working

http://ckeditor.com/demo

When I go to the demo page in IE 8 and click on the Table button in the editor, accept the defaults. Now when I click in one cell and drag to highlight multiple cells, it doesn't highlight the cells. The reason I am trying to highlight the cells is to use the right-click context menu to merge/split/etc.

This works fine on Firefox 27. But as per http://ckeditor.com/blog/CKSource-Graded-Browser-Support IE 8 should get A grade support so I am not sure why even the demo page itself is not working.

Are there some settings to tweak? What am I missing? Thanks