Exactly what were you doing to "customize" the admin? Looks like you may have double entries in your database.
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I was working on the css files for admin to change the colors. I'm not sure how i could have made the duplicate entries into the database.
If it was getting the entries from the database it should have exactly the same labels like "Configuration Configuration" and instead it says "configuration Configuration". Notice the small caps on the first entry?
I think its one of the menu generation files but i dont know which one.
Ali Peracha
Its not really duplicating itself though, as you can see one of them is capital the other one is not. I will check out english.php in admin/includes/languages. Search for BOX_HEADING_CATALOG and see what is it defined as. Is it something like catalog Catalog then I will change it to just Catalog.