Why would your text suddenly appear on the live site: "Joomla SEF URLs by Artio"

We have a testing site setup and the live site: www.redmap.com/ when we purchased the component.

Hi,
Make sure that you have the paid version of JoomSEF package installed - check that you can access the Edit .htaccess or Sitemap pages in JoomSEF.
Do you have both JoomSEF component and System - ARTIO JoomSEF plugin enabled? Have you made any custom modifications to JoomSEF's source code?

Yes, paid version installed.
Yes, can edit .htaccess within JoomSEF.
Yes, all plugins/components are installed and enabled.

Have made a mod to hide the text, but prior to this it was not working anyway.

Registration Info
Registered to: Mr. Christopher James Noble, CMYKreative Co., Ltd.
Free upgrades available until: 03 September 2013

This is what it says within JoomSEF.

Any ideas why it's still showing the code?

Basically the link is displayed when a modification in /administrator/components/com_sef/sef.xml is detected.
Yesterday we've released a new version of JoomSEF, so you can either try updating it, which should fix the problem because JoomSEF files will be replaced with the ones from installation package. Or you can try manually replace the XML file with the one from your original installation package (if you don't have the installation package for your current version of JoomSEF, I can send you the file by e-mail).

OK, thanks, we'll try an upgrade.