Stoffi,
Thanks for following up with the forum thread! As Stoffi noted, we only work when the document is in Word 2007 mode. This is due to the functionality we leverage from Word 2007.
As an aside, we're working on functionality that will inform the user that they should convert the document to a .docx file in order to use TeamSpec. So look out for that in future builds! :)
Cheers,
Juan