Empty Article
I have two namespaces, with one set as default.
I upgraded from 2.3.1 to 2.5.0, and my two articles in the non-default namespace are empty, and seem to be trying to point to the default namespace.
The article title appears in the correct forum/namespace, but clicking on it displays the header from the default namespace, although the URL shows the non-default namespace.
My forum navigation "breadcrumb" displays the correct (non-default) forum name.
Creating the article in the default namespace will work, but moving it to the correct forum displays a blank article again (no errors during the move).