Index: /issm/trunk-jpl/src/m/plot/processmesh.m
===================================================================
--- /issm/trunk-jpl/src/m/plot/processmesh.m	(revision 17575)
+++ /issm/trunk-jpl/src/m/plot/processmesh.m	(revision 17576)
@@ -37,6 +37,8 @@
 elseif isnumeric(z_field),
 	z=z_field;
+elseif isprop(md.mesh,'z'),
+	z=md.mesh.z;
 else
-	z=md.mesh.z;
+	z=zeros(size(x));
 end