Index: openacs-4/packages/acs-tcl/tcl/proxy-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/proxy-procs.tcl,v
diff -u -r1.4 -r1.5
--- openacs-4/packages/acs-tcl/tcl/proxy-procs.tcl	17 Mar 2010 22:03:55 -0000	1.4
+++ openacs-4/packages/acs-tcl/tcl/proxy-procs.tcl	27 Oct 2014 16:40:07 -0000	1.5
@@ -31,7 +31,8 @@
 	return $return_string
     }
 
-    # Now rename exec
-    rename exec real_exec
+    # Now rename exec; protect cases, where file is loaded multiple times
+    if {[info commands ::real_exec] eq ""} {rename exec real_exec}
+
     ad_proc exec {args} {This is the wrapped version of exec} {proxy::exec -call $args}
 }