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Yes, this has changed and we also experienced the strange oval arrows when updating from fuerte. You´ll probably want to just update your code accordingly (should be straightforward in most cases).

Yes, this has changed and we also experienced the strange oval arrows when updating from fuerte. You´ll probably want to just update your code accordingly (should be straightforward in most cases).

   // add a movable arrow to the interactive marker
   visualization_msgs::Marker arrow;
   arrow.type = visualization_msgs::Marker::ARROW;
-  arrow.scale.z = 0.5;
+  arrow.scale.x = 0.5;
+  arrow.scale.y = 0.1;
+  arrow.scale.z = 0.1;
+
   arrow.color.r = 0.5;
   arrow.color.g = 0;
@@ -940,7 +943,7 @@
   } else {
     start_marker.type = visualization_msgs::Marker::ARROW;
-    start_marker.scale.x = 0.2;
-    start_marker.scale.y = 0.2;
-    start_marker.scale.z = 0.8;
+    start_marker.scale.x = 0.5;
+    start_marker.scale.y = 0.1;
+    start_marker.scale.z = 0.1;
   }

Yes, this has changed and we also experienced the strange oval arrows when updating from fuerte. You´ll probably want to just update your code accordingly (should be straightforward in most cases).

/edit: Just looked up what we did:

   // add a movable arrow to the interactive marker
   visualization_msgs::Marker arrow;
   arrow.type = visualization_msgs::Marker::ARROW;
-  arrow.scale.z = 0.5;
+  arrow.scale.x = 0.5;
+  arrow.scale.y = 0.1;
+  arrow.scale.z = 0.1;
+
   arrow.color.r = 0.5;
   arrow.color.g = 0;
@@ -940,7 +943,7 @@
   } else {
     start_marker.type = visualization_msgs::Marker::ARROW;
-    start_marker.scale.x = 0.2;
-    start_marker.scale.y = 0.2;
-    start_marker.scale.z = 0.8;
+    start_marker.scale.x = 0.5;
+    start_marker.scale.y = 0.1;
+    start_marker.scale.z = 0.1;
   }

Looks like the wiki documentation you linked is wrong (at least for current ROS versions) and y and z are scaling the height/width, while x scales the length of the marker.

Identity orientation points it along the +X axis. scale.x is the arrow length, scale.y is the arrow width and scale.z is the arrow height.