I had the same problem with my mountain lion.
I fixed this by changing the line "cmd" in SASS.sublime-build (and all the other files that I created for SASS) from
["sass", "--update", "$file:${file_path}/${file_base_name}.css"]
to
["sass --update $file:${file_path}/${file_base_name}.css"]
I donโt know why, but in practice, if you write a command in an array with more than one element, this will not work, and the command all in one line will work.
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