diff --git a/CHANGES.txt b/CHANGES.txt
index 1d355354a..d8c1ecc68 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -2,6 +2,20 @@
 # MiniZinc Changelog #
 ======================
 
+Version 2.0.6
+=============
+
+Changes:
+ - Add parser support for hexadecimal floating point constants.
+
+Bug fixes:
+ - Fix bounds computation for some calls (abs, int_times).
+ - Fix flattening of some array declarations (when right hand side is
+   an identifier).
+ - Add four missing GC locks (could lead to incorrect garbage collection).
+ - Compact output model only after optimisation phase (could lead to 
+   incorrect items being removed from output model).
+
 Version 2.0.5
 =============
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 68dca994c..7ee357430 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,7 +17,7 @@ project (libminizinc CXX)
 # The version number.
 set (libminizinc_VERSION_MAJOR 2)
 set (libminizinc_VERSION_MINOR 0)
-set (libminizinc_VERSION_PATCH 5)
+set (libminizinc_VERSION_PATCH 6)
 
 if (ADDITIONAL_DATE_STRING)
   set (libminizinc_VERSION_PATCH "${libminizinc_VERSION_PATCH}.${ADDITIONAL_DATE_STRING}")
diff --git a/lib/eval_par.cpp b/lib/eval_par.cpp
index c8e08498f..8b4392c14 100644
--- a/lib/eval_par.cpp
+++ b/lib/eval_par.cpp
@@ -1684,9 +1684,6 @@ namespace MiniZinc {
           _bounds.push_back(Bounds(0,0));
         }
       } else if (c.id() == "int_times") {
-        BottomUpIterator<ComputeIntBounds> cbi(*this);
-        cbi.run(c.args()[0]);
-        cbi.run(c.args()[1]);
         Bounds b1 = _bounds.back(); _bounds.pop_back();
         Bounds b0 = _bounds.back(); _bounds.pop_back();
         if (!b1.first.isFinite() || !b1.second.isFinite() || !b0.first.isFinite() || !b0.second.isFinite()) {
@@ -1704,8 +1701,6 @@ namespace MiniZinc {
       } else if (c.id() == constants().ids.bool2int) {
           _bounds.push_back(Bounds(0,1));
       } else if (c.id() == "abs") {
-        BottomUpIterator<ComputeIntBounds> cbi(*this);
-        cbi.run(c.args()[0]);
         Bounds b0 = _bounds.back();
         if (b0.first < 0) {
           _bounds.pop_back();
diff --git a/lib/flatten.cpp b/lib/flatten.cpp
index 286e839da..1f887dc7b 100644
--- a/lib/flatten.cpp
+++ b/lib/flatten.cpp
@@ -120,11 +120,13 @@ namespace MiniZinc {
   
   /// Check if \a e is NULL or true
   bool istrue(EnvI& env, Expression* e) {
+    GCLock lock;
     return e==NULL || (e->type().ispar() && e->type().isbool()
                        && eval_bool(env,e));
   }  
   /// Check if \a e is non-NULL and false
   bool isfalse(EnvI& env, Expression* e) {
+    GCLock lock;
     return e!=NULL && e->type().ispar() && e->type().isbool()
            && !eval_bool(env,e);
   }  
@@ -2477,7 +2479,7 @@ namespace MiniZinc {
           if (vd==NULL) {
             vd = flat_exp(env,Ctx(),id->decl(),NULL,constants().var_true).r()->cast<Id>()->decl();
             id->decl()->flat(vd);
-            ArrayLit* al = vd->e()->cast<ArrayLit>();
+            ArrayLit* al = follow_id(vd->id())->cast<ArrayLit>();
             if (al->v().size()==0) {
               if (r==NULL)
                 ret.r = al;
@@ -3483,7 +3485,12 @@ namespace MiniZinc {
           case BOT_IMPL:
           {
             if (ctx.b==C_ROOT && r==constants().var_true && boe0->type().ispar()) {
-              if (eval_bool(env,boe0)) {
+              bool b;
+              {
+                GCLock lock;
+                b = eval_bool(env,boe0);
+              }
+              if (b) {
                 Ctx nctx = ctx;
                 nctx.neg = negArgs;
                 nctx.b = negArgs ? C_NEG : C_ROOT;
@@ -3497,7 +3504,12 @@ namespace MiniZinc {
               break;
             }
             if (ctx.b==C_ROOT && r==constants().var_true && boe1->type().ispar()) {
-              if (eval_bool(env,boe1)) {
+              bool b;
+              {
+                GCLock lock;
+                b = eval_bool(env,boe1);
+              }
+              if (b) {
                 Ctx nctx = ctx;
                 nctx.neg = negArgs;
                 nctx.b = negArgs ? C_NEG : C_ROOT;
@@ -5233,7 +5245,6 @@ namespace MiniZinc {
         }
       }
     }
-    e.output->compact();
 
     for (IdMap<VarOccurrences::Items>::iterator it = e.output_vo._m.begin();
          it != e.output_vo._m.end(); ++it) {
@@ -6153,6 +6164,7 @@ namespace MiniZinc {
     }
     
     m->compact();
+    e.envi().output->compact();
 
     for (IdMap<VarOccurrences::Items>::iterator it = env.vo._m.begin();
          it != env.vo._m.end(); ++it) {
diff --git a/lib/lexer.lxx b/lib/lexer.lxx
index 21d0fc9a5..869130480 100644
--- a/lib/lexer.lxx
+++ b/lib/lexer.lxx
@@ -179,7 +179,15 @@ char* bufferData(void* parm) {
                     else
                       return MZN_INVALID_INTEGER_LITERAL;
                 }
-0x[0-9A-Fa-f]+  { beginToken(yyget_extra(yyscanner), yylloc, yytext);
+
+0[xX]([0-9a-fA-F]*\.[0-9a-fA-F]+|[0-9a-fA-F]+\.)([pP][+-]?[0-9]+)|(0[xX][0-9a-fA-F]+[pP][+-]?[0-9]+)  { beginToken(yyget_extra(yyscanner), yylloc, yytext);
+                  if (strtofloatval(yytext, yylval->dValue))
+                  return MZN_FLOAT_LITERAL;
+                  else
+                  return MZN_INVALID_FLOAT_LITERAL;
+                }
+
+0[xX][0-9A-Fa-f]+  { beginToken(yyget_extra(yyscanner), yylloc, yytext);
                     if (strtointval(yytext, yylval->iValue))
                       return MZN_INTEGER_LITERAL;
                     else
diff --git a/mzn2fzn.cpp b/mzn2fzn.cpp
index adfbca697..6cee0ee2a 100644
--- a/mzn2fzn.cpp
+++ b/mzn2fzn.cpp
@@ -389,6 +389,7 @@ int main(int argc, char** argv) {
                 std::cerr << " done (" << stoptime(lasttime) << ")" << std::endl;
             } else {
               env.flat()->compact();
+              env.output()->compact();
             }
             
             if (flag_statistics) {