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Back to your bad
The problem manifests itself when trying to navigate to a specific articles from the links. If you are on the index page - the link tries to access the article by the renamed reference - there is no real module of this name and an error occurs.
If you are on the article page the problem is in the navigation links at the top of the page. The link leaves out the module name.
http://www.xxxx.com/modules//articleXXXXXXXThe error is due I think to the variable $lang_moduledirname
I don't think you can rename a physical directory to a variable language name??
Anyway I hope this is more specific.