Index: openacs-4/packages/acs-tcl/tcl/utilities-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/utilities-procs.tcl,v
diff -u -N -r1.181 -r1.182
--- openacs-4/packages/acs-tcl/tcl/utilities-procs.tcl	19 Sep 2018 07:05:32 -0000	1.181
+++ openacs-4/packages/acs-tcl/tcl/utilities-procs.tcl	10 Oct 2018 13:23:43 -0000	1.182
@@ -1366,6 +1366,14 @@
     }
 
     ns_log debug "Done running scheduled proc $proc."
+    
+    #
+    # In case there are temporary xotcl objects, clean these up to
+    # avoid surprises in schedued threads about pre-existing objects.
+    #
+    if {[info commands ::xo::at_cleanup] ne ""} {
+        ::xo::at_cleanup
+    }
 }
 
 # Initialize NSVs for ad_schedule_proc.