I've integrated compass/sass in my current Umbraco project (via cygwin) and love it. However, I can not use compass to generate a tinymce.css file that umbraco, in turn, uses for the tinyMCE editor. Everything is in place; tinymce.css is referenced in the the master template head tag, I can add styles to it through the umbraco dashboard. But when I use compass to manage tinymce.css, it breaks.

I see this line and have it in my source:

/* EDITOR PROPERTIES - PLEASE DON'T DELETE THIS LINE TO AVOID DUPLICATE PROPERTIES */

What other secret sauce ingredient is missing?