Index: trunk/packages/sipb-xen-www/code/main.py
===================================================================
--- trunk/packages/sipb-xen-www/code/main.py	(revision 445)
+++ trunk/packages/sipb-xen-www/code/main.py	(revision 446)
@@ -40,4 +40,5 @@
 from sipb_xen_database import Machine, CDROM, ctx, connect, MachineAccess, Type, Autoinstall
 import validation
+import cache_acls
 from webcommon import InvalidInput, CodeError, g
 import controls
@@ -395,14 +396,19 @@
                 ctx.current.save(disk)
 
-        if owner is not None:
+        update_acl = False
+        if owner is not None and owner != machine.owner:
             machine.owner = owner
+            update_acl = True
         if name is not None:
             machine.name = name
-        if admin is not None:
+        if admin is not None and admin != machine.administrator:
             machine.administrator = admin
+            update_acl = True
         if contact is not None:
             machine.contact = contact
 
         ctx.current.save(machine)
+        if update_acl:
+            cache_acls.refreshMachine(machine)
         transaction.commit()
     except: