diff --git a/CHR/chr.yap b/CHR/chr.yap
index 0d20a204e..85a2e55a3 100644
--- a/CHR/chr.yap
+++ b/CHR/chr.yap
@@ -312,8 +312,6 @@ notify_constrained( [M|Ms], X) :-
 % Approximation because debug state might change between calls ...
 %
 
-:- start_low_level_trace.
-
 run_suspensions( Slots) :-
 	getval( debug, State),
 	( State == off ->
@@ -323,8 +321,6 @@ run_suspensions( Slots) :-
 	),
 	true.
 
-:- stop_low_level_trace.
-
 run_suspensions_loop( []).
 run_suspensions_loop( [A|As]) :-
 	arg( 1, A, Stack),
diff --git a/pl/modules.yap b/pl/modules.yap
index 92bc77c97..9e389cf1f 100644
--- a/pl/modules.yap
+++ b/pl/modules.yap
@@ -505,8 +505,8 @@ module(N) :-
 '$process_expanded_arg'(\+V, M, \+NV) :- !,
 	'$process_expanded_arg'(V, M, NV).
 '$process_expanded_arg'(M:A, _, M:A) :- !.
-'$process_expanded_arg'(G, _, G) :-
-	'$system_predicate'(G), !.
+%'$process_expanded_arg'(G, _, G) :-
+%	'$system_predicate'(G), !.
 '$process_expanded_arg'(A, M, M:A).
 	
 '$not_in_vars'(_,[]).