Index: /issm/trunk-jpl/src/m/classes/model.m
===================================================================
--- /issm/trunk-jpl/src/m/classes/model.m	(revision 27580)
+++ /issm/trunk-jpl/src/m/classes/model.m	(revision 27581)
@@ -810,5 +810,5 @@
 			nodestoflag2=Pnode(nodestoflag1);
 			if numel(md1.stressbalance.spcvx)>1 & numel(md1.stressbalance.spcvy)>1 & numel(md1.stressbalance.spcvz)>1,
-				if isfield(md1.inversion,'vx_obs') & numel(md1.inversion.vx_obs)>1 & numel(md1.inversion.vy_obs)>1
+				if isprop(md1.inversion,'vx_obs') & numel(md1.inversion.vx_obs)>1 & numel(md1.inversion.vy_obs)>1
 					md2.stressbalance.spcvx(nodestoflag2)=md2.inversion.vx_obs(nodestoflag2); 
 					md2.stressbalance.spcvy(nodestoflag2)=md2.inversion.vy_obs(nodestoflag2);