I have done so and looked into the file office-tools.css for blueinverted before and after and it has changed from #0f1f2; to #000000; in the ListPageNormalBackground. And I have restarted N9 too and the active theme is Blueinverted! But it hasn't changed the bug as for thedead1440, it's exactly the same as before?
#ListPageNormalBackground { background-color: #000000 }