Hi jannisg, I hope not too late, if so will then as antecedent.
First of all, I had the same problem once uninstall the SASS and subsequently to install the SCSS package. I could solve it in the following way:
Inside the folder /home/user/.config/sublime-text-2/Packages/User (I use Linux, so I do not know the folder's name on MacOS), we must edit 2 files:
Note: Be sure to close all windows of ST2 before proceeding.
1.- Package Control.sublime-settings
You must delete the line: SASS, and save it.
You must edit the next line to: elif name-5:] == ".scss":, thus leaving: set_syntax(view, "SCSS", "SCSS") and save it.
Now we go up one level in the directory tree (/home/user/.config/sublime-text-2) and inside the Settings folder, we must edit the file:
Note: I had to edit that file from the command line because with other text editors could not do it (I use nano). I do not know the reason for this.
And we replace all lines containing the string: "...SASS.tmLanguage" by "Packages/SCSS/SCSS.tmLanguage" and save it.
That would be all .
Hope I have helped in solving the problem