A page has been marked as changed, but nothing is highlighted

If you get an update notification and nothing is highlighted, then the changed content is most likely in an invisible part of the page or only the order of some content has been changed.

To see the real content changes that caused the update notification:

This dialog displays the filtered content of the new version of the page and the filtered content of the old version of the page. Here you can see the real content that is used to detect updates.

You can also try to open the page in the TEXT tab of the browser. This tab shows the page without CSS definitions and all hidden parts of a page are displayed.