Can't view Word documents in Web App, edit works fine

Hi

I just installed Office Web Apps on my SharePoint 2010 development server and started the relevant services and activated the feature on the site collection.

I get the actions in the context menus to View and Edit in browser.

For Excel documents I can both edit and view them. But for Word documents I can only edit. When trying to View a document I get "Word Web App encountered an unexpected error."

For Powerpoint documents nothing works, no edit and no View with a similar error, "PowerPoint Web App encountered an error. Please try again."

Am I missing something?

-- 
Christian