Index: DamClients/DamUI/trunk/src/Dam/Forms/DamPlugin.cs
===================================================================
diff -u -r2398 -r2411
--- DamClients/DamUI/trunk/src/Dam/Forms/DamPlugin.cs	(.../DamPlugin.cs)	(revision 2398)
+++ DamClients/DamUI/trunk/src/Dam/Forms/DamPlugin.cs	(.../DamPlugin.cs)	(revision 2411)
@@ -1231,7 +1231,7 @@
                 case "ExecuteSurfacelinesExport":
                     return this.damProject != null && this.damProject.DamProjectData != null &&
                            this.damProject.DamProjectData.DamProjectType == DamProjectType.Design && this.damProject.DamProjectData.LocationJobs != null &&
-                           this.damProject.DamProjectData.LocationJobs.Count > 0;
+                           this.damProject.DamProjectData.LocationJobs.Count > 0 && lastDesignResult != null;
                 case "ClearResults":
                     return this.damProject != null && this.damProject.DamProjectData != null &&
                            this.damProject.DamProjectData.HasResults();