diff --git a/pdf_agents/agents.py b/pdf_agents/agents.py
index ef85851..d72c1af 100644
--- a/pdf_agents/agents.py
+++ b/pdf_agents/agents.py
@@ -51,7 +51,7 @@ def __init__(
             )
         except AttributeError:
             # None available in redis
-            self._background = 0.0
+            self._background = np.zeros((2, 1))
         if offline:
             _default_kwargs = self.get_offline_objects()
         else:
@@ -179,7 +179,7 @@ def background(self):
                 ]
             )
         except AttributeError:
-            self._background = 0.0
+            self._background = np.zeros((2, 1))
         return self._background
 
     # @background.setter
diff --git a/pdf_agents/startup_scripts/mmm4-kmeans.py b/pdf_agents/startup_scripts/mmm4-kmeans.py
index d69a521..2667313 100644
--- a/pdf_agents/startup_scripts/mmm4-kmeans.py
+++ b/pdf_agents/startup_scripts/mmm4-kmeans.py
@@ -8,7 +8,7 @@
     ask_on_tell=False,
     report_on_tell=True,
     k_clusters=4,
-    motor_names=["Grid_X", "Grid_Y"],
+    motor_names=["xstage", "ystage"],
 )