While developing Groovemux, my homage to the late Muxtape I kept running into this issue where my stylesheets in compass were not being compiled on heroku correctly, causing a 500 error every time the app was restarted.

Happily, I ran across this posting, and it worked like a charm.

Also, you should listen to the first mix created for Groovemux here. I’m fairly certain it only works in Chrome and Safari.