Index: /trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesMembershipChoiceDialog.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesMembershipChoiceDialog.java	(revision 14651)
+++ /trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesMembershipChoiceDialog.java	(revision 14652)
@@ -63,5 +63,5 @@
             if (oldNode.isSelected()) {
                 return ExistingBothNew.OLD;
-            } else if (bothNodes.isEnabled()) {
+            } else if (bothNodes.isSelected()) {
                 return ExistingBothNew.BOTH;
             } else if (newNode.isSelected()) {