Index: /issm/trunk/src/m/classes/model.m
===================================================================
--- /issm/trunk/src/m/classes/model.m	(revision 7173)
+++ /issm/trunk/src/m/classes/model.m	(revision 7174)
@@ -7,4 +7,6 @@
     properties (SetAccess=public) 
 		 % {{{1
+		 %Careful here: no other class should be used as default value
+		 %this is a bug of matlab
 
 		 %Model general information
@@ -251,5 +253,5 @@
 
 		 %Parallelisation parameters
-		 cluster=none;
+		 cluster=NaN;
 		 outlog='';
 		 errlog='';