Hi there!
I had some problem using the css property inspector to mangle font properties using "font" shortcut!
In the inspector, under Font section, appears another font item that refers to the single-line shortcut to font properties definition.
A common example of how to spell a font shortcut could be
font: 0.75em Verdana, Geneva, Arial, Helvetica, sans-serif;
Well, the trouble is that once font-family property is witten this way (one font after another, comma separated) the whole Font->font item inside the inspector break the string in pieces and put parts of the string inside its subelements in the wrong way.
Ehrr... It's not easy to explain, moreover because english is not my mother tongue!
The best is to give it a try and watch by yourself!
If I do something wrong, please, let me know. Else... well, could we call it a feature!? eheh
Bye bye!