diff --git a/package.json b/package.json
index 464bfbff4..0d0374703 100644
--- a/package.json
+++ b/package.json
@@ -103,7 +103,7 @@
     "metrics": "0.12.0",
     "package-generator": "0.23.0",
     "release-notes": "0.15.0",
-    "settings-view": "0.49.0",
+    "settings-view": "0.50.0",
     "snippets": "0.17.0",
     "spell-check": "0.17.0",
     "status-bar": "0.24.0",
diff --git a/spec/config-spec.coffee b/spec/config-spec.coffee
index fac7804f1..13785568f 100644
--- a/spec/config-spec.coffee
+++ b/spec/config-spec.coffee
@@ -108,10 +108,10 @@ describe "Config", ->
       expect(atom.config.getPositiveInt('editor.preferredLineLength', 80)).toBe 80
 
   describe ".save()", ->
-    nodeFs = require 'fs'
+    CSON = require 'season'
 
     beforeEach ->
-      spyOn(nodeFs, 'writeFileSync')
+      spyOn(CSON, 'writeFileSync')
       jasmine.unspy atom.config, 'save'
 
     describe "when ~/.atom/config.json exists", ->
@@ -122,12 +122,12 @@ describe "Config", ->
         atom.config.set("x.y.z", 3)
         atom.config.setDefaults("a.b", e: 4, f: 5)
 
-        nodeFs.writeFileSync.reset()
+        CSON.writeFileSync.reset()
         atom.config.save()
 
-        expect(nodeFs.writeFileSync.argsForCall[0][0]).toBe(path.join(atom.config.configDirPath, "atom.config.json"))
-        writtenConfig = JSON.parse(nodeFs.writeFileSync.argsForCall[0][1])
-        expect(writtenConfig).toEqual atom.config.settings
+        expect(CSON.writeFileSync.argsForCall[0][0]).toBe(path.join(atom.config.configDirPath, "atom.config.json"))
+        writtenConfig = CSON.writeFileSync.argsForCall[0][1]
+        expect(writtenConfig).toBe atom.config.settings
 
     describe "when ~/.atom/config.json doesn't exist", ->
       it "writes any non-default properties to ~/.atom/config.cson", ->
@@ -137,12 +137,12 @@ describe "Config", ->
         atom.config.set("x.y.z", 3)
         atom.config.setDefaults("a.b", e: 4, f: 5)
 
-        nodeFs.writeFileSync.reset()
+        CSON.writeFileSync.reset()
         atom.config.save()
 
-        expect(nodeFs.writeFileSync.argsForCall[0][0]).toBe(path.join(atom.config.configDirPath, "atom.config.cson"))
+        expect(CSON.writeFileSync.argsForCall[0][0]).toBe(path.join(atom.config.configDirPath, "atom.config.cson"))
         CoffeeScript = require 'coffee-script'
-        writtenConfig = CoffeeScript.eval(nodeFs.writeFileSync.argsForCall[0][1], bare: true)
+        writtenConfig = CSON.writeFileSync.argsForCall[0][1]
         expect(writtenConfig).toEqual atom.config.settings
 
   describe ".setDefaults(keyPath, defaults)", ->
diff --git a/spec/tokenized-buffer-spec.coffee b/spec/tokenized-buffer-spec.coffee
index 90adf05d4..9facb54b9 100644
--- a/spec/tokenized-buffer-spec.coffee
+++ b/spec/tokenized-buffer-spec.coffee
@@ -426,3 +426,13 @@ describe "TokenizedBuffer", ->
     describe "when the selector matches a run of multiple tokens at the position", ->
       it "returns the range covered by all contigous tokens (within a single line)", ->
         expect(tokenizedBuffer.bufferRangeForScopeAtPosition('.function', [1, 18])).toEqual [[1, 6], [1, 28]]
+
+  describe "when the editor.tabLength config value changes", ->
+    it "updates the tab length of the tokenized lines", ->
+      buffer = atom.project.bufferForPathSync('sample.js')
+      buffer.setText('\ttest')
+      tokenizedBuffer = new TokenizedBuffer({buffer})
+      fullyTokenize(tokenizedBuffer)
+      expect(tokenizedBuffer.tokenForPosition([0,0]).value).toBe '  '
+      atom.config.set('editor.tabLength', 6)
+      expect(tokenizedBuffer.tokenForPosition([0,0]).value).toBe '      '
diff --git a/src/config.coffee b/src/config.coffee
index 044bd3382..24990ab51 100644
--- a/src/config.coffee
+++ b/src/config.coffee
@@ -125,11 +125,11 @@ class Config
   #
   # keyPath - The {String} name of the key to retrieve
   # defaultValue - The integer {Number} to fall back to if the value isn't
-  #                positive
+  #                positive, defaults to 0.
   #
   # Returns the value from Atom's default settings, the user's configuration file,
   # or `defaultValue` if the key value isn't greater than zero.
-  getPositiveInt: (keyPath, defaultValue) ->
+  getPositiveInt: (keyPath, defaultValue=0) ->
     Math.max(@getInt(keyPath), 0) or defaultValue
 
   # Public: Sets the value for a configuration setting.
diff --git a/src/theme-manager.coffee b/src/theme-manager.coffee
index becccf027..b34d07acf 100644
--- a/src/theme-manager.coffee
+++ b/src/theme-manager.coffee
@@ -53,10 +53,13 @@ class ThemeManager
       # the first/top theme to override later themes in the stack.
       themeNames = _.clone(themeNames).reverse()
 
+      @refreshLessCache() # Update cache for packages in core.themes config
       @packageManager.activatePackage(themeName) for themeName in themeNames
-      @refreshLessCache()
+
+      @refreshLessCache() # Update cache again now that @getActiveThemes() is populated
       @loadUserStylesheet()
       @reloadBaseStylesheets()
+
       @emit('reloaded')
 
   # Internal-only:
diff --git a/src/tokenized-buffer.coffee b/src/tokenized-buffer.coffee
index d86df202f..29c127107 100644
--- a/src/tokenized-buffer.coffee
+++ b/src/tokenized-buffer.coffee
@@ -51,6 +51,9 @@ class TokenizedBuffer extends Model
       @invalidateRow(0)
       @emit "changed", { start: 0, end: lastRow, delta: 0 }
 
+    @subscribe atom.config.observe 'editor.tabLength', callNow: false, =>
+      @setTabLength(atom.config.getPositiveInt('editor.tabLength'))
+
     @reloadGrammar()
 
   # TODO: Remove when everything is a telepath model