Index: library/nx/nx.tcl
===================================================================
diff -u -re1e31d0d9747f31ff953c390dcb91796db47751e -rb60bb4c1295b7317ecc7f42258537afa9f483a70
--- library/nx/nx.tcl	(.../nx.tcl)	(revision e1e31d0d9747f31ff953c390dcb91796db47751e)
+++ library/nx/nx.tcl	(.../nx.tcl)	(revision b60bb4c1295b7317ecc7f42258537afa9f483a70)
@@ -117,7 +117,7 @@
 	#puts stderr "check $object info methods $path @ <$w>"
 	set scope [expr {[::nsf::is class $object] && !${per-object} ? "class" : "object"}] 
 	if {[::nsf::dispatch $object ::nsf::methods::${scope}::info::methods $w] eq ""} {
-	  #
+ 	  #
 	  # Create dispatch/ensemble object and accessor method (if wanted)
 	  #
 	  if {$scope eq "class"} {
@@ -1409,8 +1409,11 @@
   ::nx::Attribute public method reconfigure {} {
     #puts stderr "*** Should we reconfigure [self]???"
     unset -nocomplain :parameterSpec
+    :checkInstVar
     :makeAccessor
-    ::nsf::invalidateobjectparameter ${:domain}
+    if {[::nsf::is class ${:domain}]} {
+      ::nsf::invalidateobjectparameter ${:domain}
+    }
   }
 
   ::nx::Attribute protected method init {} {
Index: tests/parameters.test
===================================================================
diff -u -rcef0608bea97458e5dcd87615c9b8ca3fe7b464c -rb60bb4c1295b7317ecc7f42258537afa9f483a70
--- tests/parameters.test	(.../parameters.test)	(revision cef0608bea97458e5dcd87615c9b8ca3fe7b464c)
+++ tests/parameters.test	(.../parameters.test)	(revision b60bb4c1295b7317ecc7f42258537afa9f483a70)
@@ -1726,4 +1726,24 @@
   ? {o baz [expr {2 ** 64}]} "18446744073709551616"
   ? {o baz [expr {2 ** 128}]} "340282366920938463463374607431768211456"
 
+}
+
+nx::Test case reconfigure-default {
+  Object create o
+  ? {o eval {info exists :a}} 0
+  o attribute {a oldvalue}
+  ? {o eval {info exists :a}} 1
+  ? {o a} oldvalue
+  #
+  # Kind of unintuitive, we first have to unset the objvar, then call
+  # reconfigure ... Can we hide the reconfigure in e.g. the slot objs
+  # recreate step? Or provide defaults to the ::nsf::method::setter?
+  #
+  o eval {unset :a}
+  ? {o eval {info exists :a}} 0
+  o attribute {a newvalue} {
+    :reconfigure
+  }
+  ? {o eval {info exists :a}} 1
+  ? {o a} newvalue
 }
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