Quite annoying bug which occurred on 11/21/2015. It involves superimposing warnings messages bubble "nonexistent category" (in this case 2). The presence of bubbles persist and mask the category's suggestion.
<a href="//commons.wikimedia.org/wiki/User:Vive_la_Rosi%C3%A8re" title="User:Vive la Rosière">Vive la Rosière</a>
<span class="int-own-work" lang="en">Own work</span>