All categories (even non HIDDENCAT ones) are hidden.
All categories (even non HIDDENCAT ones) are hidden as of today. (not sure exactly since which revision)
For example:
http://translatewiki.net/wiki/User:Krinkle?action=purge
Has several categories, but non are visible
See also attachment for screenshot of page, html and wikitext
Version: 1.18.x
Severity: blocker
Attached: