diff --git a/cms/static/coffee/spec/main.coffee b/cms/static/coffee/spec/main.coffee
index 812763d684..7807bd39e2 100644
--- a/cms/static/coffee/spec/main.coffee
+++ b/cms/static/coffee/spec/main.coffee
@@ -43,7 +43,7 @@ requirejs.config({
         "domReady": "xmodule_js/common_static/js/vendor/domReady",
         "URI": "xmodule_js/common_static/js/vendor/URI.min",
 
-        "mathjax": "//edx-static.s3.amazonaws.com/mathjax-MathJax-727332c/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
+        "mathjax": "//cdn.mathjax.org/mathjax/2.2-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
         "youtube": "//www.youtube.com/player_api?noext",
         "tender": "//edxedge.tenderapp.com/tender_widget",
 
diff --git a/cms/static/coffee/spec/main_squire.coffee b/cms/static/coffee/spec/main_squire.coffee
index baba65804f..6cbd7a1e26 100644
--- a/cms/static/coffee/spec/main_squire.coffee
+++ b/cms/static/coffee/spec/main_squire.coffee
@@ -38,7 +38,7 @@ requirejs.config({
         "domReady": "xmodule_js/common_static/js/vendor/domReady",
         "URI": "xmodule_js/common_static/js/vendor/URI.min",
 
-        "mathjax": "//edx-static.s3.amazonaws.com/mathjax-MathJax-727332c/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
+        "mathjax": "//cdn.mathjax.org/mathjax/2.2-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
         "youtube": "//www.youtube.com/player_api?noext",
         "tender": "//edxedge.tenderapp.com/tender_widget.js"
 
diff --git a/cms/static/require-config.js b/cms/static/require-config.js
index bbfd8a5908..2c2635afdf 100644
--- a/cms/static/require-config.js
+++ b/cms/static/require-config.js
@@ -69,7 +69,7 @@ require.config({
             // so that require doesn't fall over
             "js/src/tender_fallback"
         ],
-        "mathjax": "//edx-static.s3.amazonaws.com/mathjax-MathJax-727332c/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
+        "mathjax": "//cdn.mathjax.org/mathjax/2.2-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
         "youtube": [
             // youtube URL does not end in ".js". We add "?noext" to the path so
             // that require.js adds the ".js" to the query component of the URL,
diff --git a/common/djangoapps/enrollment/tests/test_views.py b/common/djangoapps/enrollment/tests/test_views.py
index 06e55a6d02..2f4b5fff9a 100644
--- a/common/djangoapps/enrollment/tests/test_views.py
+++ b/common/djangoapps/enrollment/tests/test_views.py
@@ -87,28 +87,6 @@ class EnrollmentTest(ModuleStoreTestCase, APITestCase):
         self.assertEqual(1, len(data['course_modes']))
         self.assertEqual('professional', data['course_modes'][0]['slug'])
 
-    def test_unenroll(self):
-        # Create a course mode.
-        CourseModeFactory.create(
-            course_id=self.course.id,
-            mode_slug='honor',
-            mode_display_name='Honor',
-        )
-
-        # Create an enrollment
-        resp = self._create_enrollment()
-
-        # Deactivate the enrollment in the course and verify the URL we get sent to
-        resp = self.client.post(reverse(
-            'courseenrollment',
-            kwargs={'course_id': (unicode(self.course.id))}
-        ), {'deactivate': True})
-        self.assertEqual(resp.status_code, status.HTTP_200_OK)
-        data = json.loads(resp.content)
-        self.assertEqual(unicode(self.course.id), data['course']['course_id'])
-        self.assertEqual('honor', data['mode'])
-        self.assertFalse(data['is_active'])
-
     def test_user_not_authenticated(self):
         # Log out, so we're no longer authenticated
         self.client.logout()
@@ -133,26 +111,6 @@ class EnrollmentTest(ModuleStoreTestCase, APITestCase):
         resp = self.client.post(reverse('courseenrollment', kwargs={'course_id': (unicode(self.course.id))}))
         self.assertEqual(resp.status_code, 200)
 
-    def test_unenroll_not_enrolled_in_course(self):
-        # Deactivate the enrollment in the course and verify the URL we get sent to
-        resp = self.client.post(reverse(
-            'courseenrollment',
-            kwargs={'course_id': (unicode(self.course.id))}
-        ), {'deactivate': True})
-        self.assertEqual(resp.status_code, status.HTTP_400_BAD_REQUEST)
-
-    def test_invalid_enrollment_mode(self):
-        # Request an enrollment with verified mode, which does not exist for this course.
-        resp = self.client.post(reverse(
-            'courseenrollment',
-            kwargs={'course_id': (unicode(self.course.id))}),
-            {'mode': 'verified'}
-        )
-        self.assertEqual(resp.status_code, status.HTTP_400_BAD_REQUEST)
-        data = json.loads(resp.content)
-        self.assertEqual(unicode(self.course.id), data['course_id'])
-        self.assertEqual('honor', data['course_modes'][0]['slug'])
-
     def test_with_invalid_course_id(self):
         # Create an enrollment
         resp = self.client.post(reverse('courseenrollment', kwargs={'course_id': 'entirely/fake/course'}))
diff --git a/common/djangoapps/enrollment/views.py b/common/djangoapps/enrollment/views.py
index c3970cfe58..2b0f409e18 100644
--- a/common/djangoapps/enrollment/views.py
+++ b/common/djangoapps/enrollment/views.py
@@ -108,11 +108,7 @@ def get_course_enrollment(request, course_id=None):
 
     """
     try:
-        if 'mode' in request.DATA:
-            return Response(api.update_enrollment(request.user.username, course_id, request.DATA['mode']))
-        elif 'deactivate' in request.DATA:
-            return Response(api.deactivate_enrollment(request.user.username, course_id))
-        elif course_id and request.method == 'POST':
+        if course_id and request.method == 'POST':
             return Response(api.add_enrollment(request.user.username, course_id))
         else:
             return Response(api.get_enrollment(request.user.username, course_id))
diff --git a/common/templates/mathjax_include.html b/common/templates/mathjax_include.html
index 0ddbd68eee..fd0f4d792f 100644
--- a/common/templates/mathjax_include.html
+++ b/common/templates/mathjax_include.html
@@ -33,4 +33,4 @@
 <!-- This must appear after all mathjax-config blocks, so it is after the imports from the other templates.
      It can't be run through static.url because MathJax uses crazy url introspection to do lazy loading of
      MathJax extension libraries -->
-<script type="text/javascript" src="https://edx-static.s3.amazonaws.com/mathjax-MathJax-727332c/MathJax.js?config=TeX-MML-AM_HTMLorMML-full"></script>
+<script type="text/javascript" src="https://cdn.mathjax.org/mathjax/2.2-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full"></script>
diff --git a/lms/static/js/spec/main.js b/lms/static/js/spec/main.js
index f081eb38e1..bbb137be6f 100644
--- a/lms/static/js/spec/main.js
+++ b/lms/static/js/spec/main.js
@@ -44,7 +44,7 @@
             'jasmine.async': 'xmodule_js/common_static/js/vendor/jasmine.async',
             'draggabilly': 'xmodule_js/common_static/js/vendor/draggabilly.pkgd',
             'domReady': 'xmodule_js/common_static/js/vendor/domReady',
-            'mathjax': '//edx-static.s3.amazonaws.com/mathjax-MathJax-727332c/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured',
+            'mathjax': '//cdn.mathjax.org/mathjax/2.2-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured',
             'youtube': '//www.youtube.com/player_api?noext',
             'tender': '//edxedge.tenderapp.com/tender_widget',
             'coffee/src/ajax_prefix': 'xmodule_js/common_static/coffee/src/ajax_prefix',