Lately we are having issue with compass, exactly with sass > 3.2.9 compatibility with stitch, so one of solution is to install olders versions that work. This iis what I needed:
> gem install sass --version 3.2.9
> gem install compass --version 0.12.0
> gem install stitch --version 0.1.6>gem install bootstrap-sass --version 3.3.1.0
