Thread:Extension talk:SphinxSearch/Incategory, Intitle, Prefix not working for me

Hi, I have installed SphinxSearch Extension (0.8.5) on MediaWiki 1.21.1 and Sphinx (2.2.4). The general engine works well, including "did you mean" and other nice features. But I cannot make to work the incategory, intitle and prefix search.

The  is there.

What else can I check? Thank you for your help.