[wdvltalk-social] wordpress ignoring style sheet!

[joseph]

I have put EasyPHP on the desktop, and downloaded the same version of 
Wordpress as on my host, with Boozurk theme on W7 64 Home premium on a 
new Medion (if pretty basic).

I have made some amendments to the style.css, most particularly h4. 
Whatever I do I cannot get it to show the colour or to appear as small 
caps - nor make any of my direct changes work [using TopStyle]. A change 
to body type [to serif] via the theme appearance pages seems to be 
implemented, but is written into the style.css too, as expected.

The css is plain vanilla h4, and I have put no style= in the html for 
it, since it has no special name.

Is there a glaringly obvious reason for my failure, or is it more obscure?

TIA

Joseph