diff --git a/caravel/utils.py b/caravel/utils.py
index 718b3641e607..36dc6eb431fc 100644
--- a/caravel/utils.py
+++ b/caravel/utils.py
@@ -5,6 +5,7 @@
 from __future__ import unicode_literals
 
 from datetime import datetime
+import decimal
 import functools
 import json
 import logging
@@ -229,6 +230,8 @@ def base_json_conv(obj):
         return int(obj)
     elif isinstance(obj, set):
         return list(obj)
+    elif isinstance(obj, decimal.Decimal):
+        return float(obj)
 
 
 def json_iso_dttm_ser(obj):
diff --git a/caravel/viz.py b/caravel/viz.py
index 87e4bf0180b2..8dd3004a0df3 100644
--- a/caravel/viz.py
+++ b/caravel/viz.py
@@ -103,7 +103,7 @@ def reassignments(self):
 
     def get_url(self, **kwargs):
         """Returns the URL for the viz"""
-        d = self.form_data.copy()
+        d = self.orig_form_data.copy()
         if 'json' in d:
             del d['json']
         if 'action' in d:
diff --git a/tests/core_tests.py b/tests/core_tests.py
index e67329d13578..183329e71242 100644
--- a/tests/core_tests.py
+++ b/tests/core_tests.py
@@ -8,6 +8,7 @@
 import doctest
 import json
 import imp
+import logging
 import os
 import unittest
 from mock import Mock, patch
@@ -149,7 +150,7 @@ def test_slices(self):
                 (slc.slice_name, 'csv_endpoint', slc.viz.csv_endpoint),
             ]
         for name, method, url in urls:
-            print("[name]/[{method}]: {url}".format(**locals()))
+            logging.info("[{name}]/[{method}]: {url}".format(**locals()))
             self.client.get(url)
 
     def test_dashboard(self):