I had a similar problem. It was very stupid from me, but then again, most of the problems are in programming. My problem was that although I had everything correctly configured for standalone, according to:
https://github.com/twbs/bootstrap-sass
I used a subfolder structure like this:
project -- stylesheets -- bootstrap -- sass ---- main.scss ------- subfolder1 ----------- partial.scss ------- subfolder2 ----------- partial2.scss
And in my main.scss I used @import correctly, for example:
@import "subfolder1 / partial.scss"
The problem was this: Compass sees partial correctly if file names begin with an underscore!
As soon as I renamed the files to _partial1.scss and _partial2.scss, everything worked without problems.
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