I created a module compasstest, with a _config.php and a css directory holding a single file test.css. Then I visited: mydomain/dev/compass/convert?module=comp\\... The sass directory is created, but the converted file is not. The gems are installed in silverstripe-cache/gems/, the directories are writable. I've tried installing the compass files to a different folder, manually installing them, the result is always the same. There is no css2sass file present, as far as I can see. What am I doing wrong? is it that I can't execute this from the browser URL? Should I use sake instead? Or is it something else? [EDIT] I tried installing sake, but no luck with Debian Squeeze yet ... Thanks Matty, I'm happy to work with that link one for now As for the rebuild from scss to css: that seems to work fine for me (using the newest from master). I've sake working fine now - my bad for not reading the docs properly. But the error is still there, so I suppose it could either be a bug or some settings issue on my server. Maybe someone can reproduce this?