includePaths not working

[Chadwickd]

I'm using brackets 1.10 and version 2.0.7 of the plugin. As far as I can tell includePaths doesn't work. I have the below folder structure.

and I'm using the below in my preference file.
{
"sass.enabled": false,
"sass.compiler": "libsass",
"path": {
"custom/custom.scss": {
"sass.enabled": true,
"sass.options": {
"includePaths": [
"../custom"
],
"outputDir": "../../css/custom",
"imagePath": null,
"sourceComments": false,
"outputStyle": "nested"
},
"linting.collapsed": false
},
"lib/lib.scss": {
"sass.enabled": true,
"sass.options": {
"includePaths": [
"../lib"
],
"outputDir": "../../css/lib",
"imagePath": null,
"sourceComments": false,
"outputStyle": "nested"
},
"linting.collapsed": false
}
}
}

but whenever I save "_custom-variables" nothing happens. only saving my custom file causes a compile.