Just found this one. If you are compiling using fcsh from Flex SDK 3.2 (read
here if you are not) be warned that if you update an embedded css (passed using -defaults-css-files) fsch doesn't realize and throws:
Nothing has changed since the last compile. Skip...
To bypass this you can either a) do a dummie update to any of the as or mxml files or b) use the standard (but damn slow) mxmlc compiler that works as expected.
I've opened
a bug with the same title, hopefully this will get fixed at some point in the future.