Weird thing today...
I added a shape to my page and clicked text tool to add text to the shape. The text was underlined without the underline icon selected. It seems it has entered the text as a link. If you get the same problem simply click the text with the text tool and a blue box will appear. Just click 'Remove' to remove the link and it will revert to ordinary text.
I haven't a clue why it has defaulted to a link as I added another shape and it was fine.
Anyway it is a bit confusing initially as you can't figure why it is underlined...
Hope this helps.