Using the updated 1.7.0.58 beta I've been exploring the text styles options and trying to get to grips with working with styles, using Arial and Open Sans fonts. In doing so, I have noticed that if you try to edit the Capitals part of the Text Styles, not all options seem to be applied correctly. Caps to small caps is one option, and another is Titling. Neither appear as I would expect, with the text appearing in sentence case. Some options I'm not certain how they would appear: ie they are changing but whether it is to what you intend I'm not certain. So probably worth checking all the Capitals options.
I know I am not skilled at using styles (it's on my list of things to get to grips with), but the different options do seem to be behaving consistently; just not all of them are as I would expect.