I pusblished a new version of CSS Preprocessor (csspp) because 1.0.9 and older had a bug in the output process which would not write the commas between lists of arguments in a declaration. For example, a box-shadow can be defined as follow:
box-shadow: 3px 2px 7px #888888, 0 0 4px #008800;
Versions before 1.0.10 would skip the comma after the first color, as shown below, rendering the whole declaration useless.
box-shadow:3px 2px 7px #8880 0 4px #080;
Download right here: https://sourceforge.net/projects/csspp/files/