Index: openacs-4/packages/acs-lang/tcl/locale-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-lang/tcl/locale-procs.tcl,v
diff -u -r1.39.2.3 -r1.39.2.4
--- openacs-4/packages/acs-lang/tcl/locale-procs.tcl	29 May 2016 11:03:18 -0000	1.39.2.3
+++ openacs-4/packages/acs-lang/tcl/locale-procs.tcl	29 May 2016 11:15:30 -0000	1.39.2.4
@@ -323,7 +323,7 @@
         # Check, if someone hacked the cookie
         #
         if {![lang::conn::valid_locale_p $locale]} {
-            error "invalid locale cookie"
+            error "invalid locale cookie '$locale'"
         }
     } else {
         set locale [db_string get_user_site_wide_locale {} -default "$system_locale"]