I too was working from the Office 2010 Ribbon. It appears it's different in this area.

Try the following key-stroke sequence:
Alt-a, Alt-r, u, l
This should select the whole document, then open the language settings dialogue, where you should ensure you have the appropriate language selected and the 'do not check spelling or grammar' option UNchecked.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]