diff --git a/C/tracer.c b/C/tracer.c
index c4de2fb23..38bd6e2a1 100644
--- a/C/tracer.c
+++ b/C/tracer.c
@@ -91,15 +91,19 @@ static char *send_tracer_message(char *start, char *name, arity_t arity,
                                           Quote_illegal_f | Handle_vars_f);
         size_t sz;
         if (sn == NULL) {
-          sn = "<* error *>";
+	  sn = malloc(strlen("<* error *>")+1);
+	  strcpy((char*)sn, "<* error *>");
         }
         sz = strlen(sn);
         if (max <= sz) {
           min = sz + 1024;
           expand = true;
+	  free((void*)sn);
           continue;
         }
         strcpy(s, sn);
+	free((void*)sn);
+	sn = NULL;
         s += sz;
         max -= sz;
       }
diff --git a/os/fmem.c b/os/fmem.c
index e2e586f67..faebfb81e 100644
--- a/os/fmem.c
+++ b/os/fmem.c
@@ -204,8 +204,6 @@ int Yap_open_buf_write_stream(encoding_t enc, memBufSource src) {
 
   st = GLOBAL_Stream + sno;
   st->status = Output_Stream_f | InMemory_Stream_f;
-  if (src)
-    st->status |= FreeOnClose_Stream_f;
   st->linepos = 0;
   st->charcount = 0;
   st->linecount = 1;
@@ -269,7 +267,7 @@ FILE *f = GLOBAL_Stream[sno].file;
   memcpy(buf, s, len);
   // s[fseek(GLOBAL_Stream[sno].file, 0, SEEK_END)] = '\0';
 #else
-  fread(buf, sz, 1, GLOBAL_Stream[sno].file);
+  fread(buf, len, 1, GLOBAL_Stream[sno].file);
 #endif
   buf[len] = '\0';
   return buf;
diff --git a/packages/python/py2pl.c b/packages/python/py2pl.c
index 4e85b6ab5..7193c28a0 100644
--- a/packages/python/py2pl.c
+++ b/packages/python/py2pl.c
@@ -90,7 +90,10 @@ else if (PyUnicode_Check(pVal)) {
       rc = rc && PL_unify_atom_chars(t, s);
     else
 #endif
+      if  (pyStringToString)
   return MkStringTerm(s);
+      else
+	return MkAtomTerm(Yap_LookupAtom(s));
 }
 else if (PyByteArray_Check(pVal)) {
   return MkStringTerm(PyByteArray_AsString(pVal));
diff --git a/packages/python/py4yap.h b/packages/python/py4yap.h
index 280b9e1e8..79c29543a 100644
--- a/packages/python/py4yap.h
+++ b/packages/python/py4yap.h
@@ -93,6 +93,7 @@ extern PyObject *py_Sys;
 #define py_Builtin PyEval_GetBuiltins()
 
 extern X_API bool python_in_python;
+extern bool pyStringToString;
 
 extern bool python_release_GIL(term_t gstate);
 extern term_t python_acquire_GIL(void);
diff --git a/packages/python/pypreds.c b/packages/python/pypreds.c
index b6121dde2..292e223e3 100644
--- a/packages/python/pypreds.c
+++ b/packages/python/pypreds.c
@@ -231,6 +231,24 @@ static foreign_t assign_python(term_t exp, term_t name) {
   pyErrorAndReturn(b);
 }
 
+
+static foreign_t python_string_to(term_t f) {
+  if (PL_is_atom(f)) {
+    char *s = NULL;
+    if (!PL_get_chars(f, &s, CVT_ALL | CVT_EXCEPTION | REP_UTF8)) {
+      pyErrorAndReturn(false);
+    }
+    if (!strcmp(s,"atom"))
+      pyStringToString = false;
+    if (!strcmp(s,"string"))
+      pyStringToString = true;
+    else
+      return false;
+    return true;
+  }
+  return true;
+}
+
 static foreign_t python_builtin_eval(term_t caller, term_t dict, term_t out) {
   PyErr_Clear();
   PyObject *pI, *pArgs, *pOut;
@@ -759,6 +777,7 @@ install_t install_pypreds(void) {
   PL_register_foreign("python_access", 3, python_access, 0);
   PL_register_foreign("python_threaded", 0, p_python_threaded, 0);
   PL_register_foreign("python_clear_errors", 0, python_clear_errors, 0);
+  PL_register_foreign("python_string_to", 0, python_string_to, 1);
 
   init_python_vfs();
 }
diff --git a/packages/python/python.c b/packages/python/python.c
index 5c287a36e..ca176ebb5 100644
--- a/packages/python/python.c
+++ b/packages/python/python.c
@@ -28,6 +28,8 @@ PyObject *py_Context;
 
 X_API PyObject *Py_f2p;
 
+bool pyStringToString;
+
 extern X_API bool python_in_python;
 
 static void add_modules(void) {
diff --git a/packages/python/python.pl b/packages/python/python.pl
index db4082ee7..7cf3cc275 100644
--- a/packages/python/python.pl
+++ b/packages/python/python.pl
@@ -28,6 +28,7 @@
 	   array_to_python_tuple/4,
 	   array_to_python_view/5,
 	   python/2,
+	   python_string_to/1,
 	   acquire_GIL/0,
 	   release_GIL/0,
 	   python_threaded/0,
diff --git a/packages/yap-lbfgs/CMakeLists.txt b/packages/yap-lbfgs/CMakeLists.txt
index d36147063..de3695233 100644
--- a/packages/yap-lbfgs/CMakeLists.txt
+++ b/packages/yap-lbfgs/CMakeLists.txt
@@ -20,9 +20,11 @@ ENDIF (NOT YAP_FOUND)
 
     )
 
+  SET ( LBFGS_HEADERS ${CMAKE_CURRENT_SOURCE_DIR}/${LBFGS_SRC}/lib/arithmetic_ansi.h  ${CMAKE_CURRENT_SOURCE_DIR}/${LBFGS_SRC}/lib/arithmetic_sse_double.h  ${CMAKE_CURRENT_SOURCE_DIR}/${LBFGS_SRC}/lib/arithmetic_sse_float.h )
+    
   SET ( LBFGS_SOURCES
   
-  ${CMAKE_CURRENT_SOURCE_DIR}/${LBFGS_SRC}/lib/arithmetic_ansi.h  ${CMAKE_CURRENT_SOURCE_DIR}/${LBFGS_SRC}/lib/arithmetic_sse_double.h  ${CMAKE_CURRENT_SOURCE_DIR}/${LBFGS_SRC}/lib/arithmetic_sse_float.h ${CMAKE_CURRENT_SOURCE_DIR}/${LBFGS_SRC}/lib/lbfgs.c ${CMAKE_CURRENT_SOURCE_DIR}/yap_lbfgs.c)
+  ${CMAKE_CURRENT_SOURCE_DIR}/${LBFGS_SRC}/lib/lbfgs.c ${CMAKE_CURRENT_SOURCE_DIR}/yap_lbfgs.c)
 
   add_library(LBFGS
   ${LBFGS_SOURCES})
diff --git a/packages/yap-lbfgs/ex1.pl b/packages/yap-lbfgs/ex1.pl
index 45731c13b..77258b20d 100644
--- a/packages/yap-lbfgs/ex1.pl
+++ b/packages/yap-lbfgs/ex1.pl
@@ -40,7 +40,8 @@ progress(FX,X,G,X_Norm,G_Norm,Step,_N,Iteration,Ls, 0) :-
 
 
 demo :-
-	format('Optimizing the function f(x0) = sin(x0)~n',[]),
+start_low_level_trace,
+    format('Optimizing the function f(x0) = sin(x0)~n',[]),
 	optimizer_initialize(1,X,Status),
 
 
diff --git a/packages/yap-lbfgs/yap_lbfgs.c b/packages/yap-lbfgs/yap_lbfgs.c
index 800cf3791..0a3c21f48 100644
--- a/packages/yap-lbfgs/yap_lbfgs.c
+++ b/packages/yap-lbfgs/yap_lbfgs.c
@@ -239,17 +239,15 @@ meaning.
 static YAP_Bool optimizer_run(void) {
   int ret = 0;
   int n =  YAP_IntOfTerm(YAP_ARG1);
-  YAP_Term t2 = YAP_ARG2;
   YAP_Int s1, s2;
   lbfgsfloatval_t fx;
-  lbfgsfloatval_t *temp_x = ( lbfgsfloatval_t *) YAP_IntOfTerm(YAP_ARG2),
-    *temp_ox = ( lbfgsfloatval_t *) YAP_IntOfTerm(YAP_ARG4);
+  lbfgsfloatval_t *temp_x = ( lbfgsfloatval_t *)YAP_IntOfTerm( YAP_ArgOfTerm(1, YAP_ARG2)),
+    *temp_ox = ( lbfgsfloatval_t *)  YAP_IntOfTerm(YAP_ArgOfTerm(1,YAP_ARG4));
   lbfgs_parameter_t *temp_p = (lbfgs_parameter_t * ) YAP_IntOfTerm(YAP_ARG6);
-
-  //optimizer_status = OPTIMIZER_STATUS_RUNNING;
   ret = lbfgs(n, temp_x, &fx, evaluate, progress, temp_ox, temp_p);
 
-  return YAP_Unify(YAP_MkIntTerm(ret), YAP_ARG5);
+  return YAP_Unify(YAP_MkIntTerm(ret), YAP_ARG5) &&
+    YAP_Unify(YAP_MkFloatTerm(fx), YAP_ARG3);
 }
 
 
diff --git a/pl/consult.yap b/pl/consult.yap
index f4afdb88e..490f14224 100644
--- a/pl/consult.yap
+++ b/pl/consult.yap
@@ -311,7 +311,7 @@ load_files(Files0,Opts) :-
     ( LC > 0
     ->
       '__NB_getval__'('$lf_status', OldTOpts, fail),
-        nonvar(OldTOpts),
+        nonvar(OldTOpts),  functor( OldTOpts, opt, LastOpt ),
     '$lf_opt'(autoload, OldTOpts, OldAutoload),
          '$lf_opt'('$context_module', OldTOpts, OldContextModule)
     ;
diff --git a/pl/messages.yap b/pl/messages.yap
index 705eedcf1..703fa0bfe 100644
--- a/pl/messages.yap
+++ b/pl/messages.yap
@@ -257,15 +257,14 @@ location(style_check(A,LN,FileName,B ), Level , LC) -->
 	display_consulting( FileName, Level,style_check(A,LN,FileName,B ),  LC ),
 	[ '~a:~d:0 ~a ' - [FileName,LN,Level] ] .
 location( error(_,Info), Level, LC ) -->
-
     { '$error_descriptor'(Info, Desc) },
-   {
-   query_exception(prologPredFile, Desc, File),
+    {
+	query_exception(prologPredFile, Desc, File),
 	query_exception(prologPredLine, Desc, FilePos),
 	query_exception(prologPredModule, Desc, M),
 	query_exception(prologPredName, Desc, Na),
 	query_exception(prologPredArity, Desc, Ar)
-	},
+    },
   !,
 display_consulting( File, Level, Info, LC ),
   {simplify_pred(M:Na/Ar,FF)},
@@ -358,7 +357,7 @@ display_consulting( F, Level, Info, LC) -->
     {  LC > 0,
        '$error_descriptor'(Info, Desc),
        query_exception(prologParserFile, Desc, F0),
-       query_exception(prologarserLine, Desc, L),
+       query_exception(prologParserLine, Desc, L),
        F \= F0
     }, !,
     [ '~a:~d:0: ~a raised at:'-[F0,L,Level], nl ].