tonyclarkson on "Can't add link in post after updating"

I'm using Twenty Ten for a site and after updating I've been told about a few problems from the client. The one today being that they can't add a link to selected text in a post. I had a look and when you highlight the text and click the link icon nothing happens. Tried adding the link using the Text mode instead of Visual, but the text tab no longer works either.
Also a post now shows the username as the author and not the Public Display Name at the first level, once you click to view the post the author name changes to the display name.
These used to work before the updates, could someone take a look please.
http://www.pontesbury.info