Keynote resets language after opening

Hi there,

Every time I open Keynote, the program resets the default language to U.S. English. I can manually change the language to Dutch in the spelling checker, but that only works as long as keynote is running. I don't have this problem with Numbers or Pages or any other program. I have the problem on both my MacBook Air (mid 2012) and iMac (mid 2010).

Further information:

- I am running OSX 10.8.2 on both my Macs

- I am running Keynote 09 5.2 (1125) on both my Macs, legally downloaded from the app store

- System language is set to Dutch on both my Macs

- The problem exist for locally stored documents, documents stored in Dropbox and in iCloud

I have this problem for the last couple of weeks now, and it is really starting to annoy me. Because every time I open keynote, I must manually switch to Dutch and close and open the document again (the document, not Keynote itself), because if I don't the red lines stay under every single word in the document.

Hope that somebody can help me solve this problem.

Thanks, Sebastiaan