Office 2008 spelling checker problem

[bushi]

I have a strange problem with the office 2008 spelling checker.

-If I start a new document and type errors, it doesn't draw red lines under them
-If I go to tools>language>dutch and click ok it draws red lines under errors. but he doesn't do it anymore when i start a new document (even when i set dutch to default)
-If I select English as default language, it does remember it when i start new documents..
😕

 

[bushi]

seems like all the other languages work just fine..
couldn't it have anything to do with the standard dictionary of my macbook (dutchà)