diff --git a/src/include/ranges/urange.cc.h b/src/include/ranges/urange.cc.h
index 9e93c0c..41efa29 100644
--- a/src/include/ranges/urange.cc.h
+++ b/src/include/ranges/urange.cc.h
@@ -380,6 +380,7 @@ namespace CNORXZ
 	    static_assert(std::is_fundamental<MetaT>::value, "got non-fundamental type");
 	    CXZ_ASSERT(r->dim() == 1, "range cast into URange<Int>: source range must have dim = 1, got " << r->dim());
 	    Sptr<URange<MetaT>> o = nullptr;
+	    // TODO: cast from CRange!!!
 	    o = transform<SizeT>(r); if(o) return o;
 	    o = transform<Int>(r); if(o) return o;
 	    o = transform<LInt>(r); if(o) return o;
diff --git a/src/opt/mpi/include/rrange.cc.h b/src/opt/mpi/include/rrange.cc.h
index d8c4063..18e9bfe 100644
--- a/src/opt/mpi/include/rrange.cc.h
+++ b/src/opt/mpi/include/rrange.cc.h
@@ -72,8 +72,8 @@ namespace CNORXZ
 	    if constexpr(has_static_sub<IndexI>::value){
 		constexpr SizeT NI = index_dim<IndexI>::value;
 		iter<0,NI>( [&](auto mu) {
-		    const SizeT jmu = (IB::mPos / ilf[mu].val()*klf[mu].val()) %
-			i[mu]->lmax().val()*k[mu]->lmax().val();
+		    const SizeT jmu = (IB::mPos / (ilf[mu].val()*klf[mu].val())) %
+			(i[mu]->lmax().val() * k[mu]->lmax().val());
 		    r += ( jmu / i[mu]->lmax().val() ) * klf[mu].val();
 		    l += ( jmu % i[mu]->lmax().val() ) * ilf[mu].val();
 		}, NoF{} );
@@ -81,8 +81,8 @@ namespace CNORXZ
 	    else if constexpr( has_static_sub<IndexK>::value){
 		constexpr SizeT NI = index_dim<IndexK>::value;
 		iter<0,NI>( [&](auto mu) {
-		    const SizeT jmu = (IB::mPos / ilf[mu].val()*klf[mu].val()) %
-			i[mu]->lmax().val()*k[mu]->lmax().val();
+		    const SizeT jmu = (IB::mPos / (ilf[mu].val()*klf[mu].val())) %
+			(i[mu]->lmax().val() * k[mu]->lmax().val());
 		    r += ( jmu / i[mu]->lmax().val() ) * klf[mu].val();
 		    l += ( jmu % i[mu]->lmax().val() ) * ilf[mu].val();
 		}, NoF{} );
@@ -90,8 +90,8 @@ namespace CNORXZ
 	    else {
 		const SizeT NI = mI->dim();
 		for(SizeT mu = 0; mu != NI; ++mu){
-		    const SizeT jmu = (IB::mPos / ilf[mu].val()*klf[mu].val()) %
-			i[mu]->lmax().val()*k[mu]->lmax().val();
+		    const SizeT jmu = (IB::mPos / (ilf[mu].val()*klf[mu].val())) %
+			(i[mu]->lmax().val() * k[mu]->lmax().val());
 		    r += ( jmu / i[mu]->lmax().val() ) * klf[mu].val();
 		    l += ( jmu % i[mu]->lmax().val() ) * ilf[mu].val();
 		}
@@ -203,8 +203,10 @@ namespace CNORXZ
 	{
 	    const SizeT r = mK->lex();
 	    String o;
-	    auto x = mI->stringMeta();
-	    bcast(x, r);
+	    if(r == getRankNumber()){
+		o = mI->stringMeta();
+	    }
+	    bcast(o, r);
 	    return o;
 	}
 
@@ -213,9 +215,11 @@ namespace CNORXZ
 	{
 	    MetaType o;
 	    if constexpr(Typemap<MetaType>::exists){
-		auto x = mI->meta();
 		const SizeT r = mK->lex();
-		bcast(x, r);
+		if(r == getRankNumber()){
+		    o = mI->meta();
+		}
+		bcast(o, r);
 	    }
 	    return o;
 	}
diff --git a/src/opt/mpi/tests/CMakeLists.txt b/src/opt/mpi/tests/CMakeLists.txt
index eba47b0..3edd335 100644
--- a/src/opt/mpi/tests/CMakeLists.txt
+++ b/src/opt/mpi/tests/CMakeLists.txt
@@ -4,4 +4,5 @@ include_directories(${CMAKE_SOURCE_DIR}/src/tests)
 add_executable(mpirrutest rrange_unit_test.cc)
 add_dependencies(mpirrutest cnorxz cnorxzmpi test_lib)
 target_link_libraries(mpirrutest ${GTEST_BOTH_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT} ${MPI_LIBS} cnorxz cnorxzmpi test_lib)
-add_test(NAME mpirrutest COMMAND mpirrutest)
+set(MPI_TEST_COMMAND mpirun -n 4 mpirrutest)
+add_test(NAME mpirrutest COMMAND ${MPI_TEST_COMMAND})
diff --git a/src/opt/mpi/tests/rrange_unit_test.cc b/src/opt/mpi/tests/rrange_unit_test.cc
index dc134b8..6f2b6ce 100644
--- a/src/opt/mpi/tests/rrange_unit_test.cc
+++ b/src/opt/mpi/tests/rrange_unit_test.cc
@@ -25,6 +25,29 @@ namespace
     using Test::Numbers;
     using namespace CNORXZ::mpi;
 
+    class MPIEnv : public ::testing::Environment
+    {
+    public:
+
+	MPIEnv(int argc, char** argv) : mArgc(argc), mArgv(argv) {}
+	
+	virtual ~MPIEnv() override {}
+
+	virtual void SetUp() override
+	{
+	    MPI_Init(&mArgc, &mArgv);
+	}
+
+	virtual void TearDown() override
+	{
+	    MPI_Finalize();
+	}
+
+    protected:
+	int mArgc;
+	char** mArgv;
+    };
+    
     class RRange_Test : public ::testing::Test
     {
     protected:
@@ -63,9 +86,38 @@ namespace
     TEST_F(RRange_Test, Basics)
     {
 	EXPECT_EQ(mRRange->size(), mGRange->size());
+    }
+
+    TEST_F(RRange_Test, Local)
+    {
 	typedef UIndex<Int> UI;
 	MIndex<UI,UI,UI,UI> mi(mRRange->sub(1));
+	MIndex<CIndex,CIndex,CIndex,CIndex> ri(mRRange->sub(0));
 	EXPECT_EQ(mi.lmax().val(), mGRange->size()/mRRange->sub(0)->size());
+	EXPECT_EQ(ri.lmax().val(), getNumRanks());
+	const SizeT rank = getRankNumber();
+	ri = rank;
+	iter<0,4>( [&](auto i) {
+	    UI xi = *mi.pack()[i];
+	    const SizeT max = xi.lmax().val();
+	    const Int s = mGRange->sub(i)->size()/2;
+	    const SizeT rx = ri.pack()[i]->lex();
+	    for(; xi.lex() != max; ++xi){
+		EXPECT_EQ(*xi, static_cast<Int>(xi.lex()) - s + static_cast<Int>(max*rx));
+	    }
+	}, NoF {} );
+    }
+    
+    TEST_F(RRange_Test, Global)
+    {
+	RIndex<YIndex,YIndex> rgi(mRRange);
+	YIndex gi(mGRange);
+	for(SizeT c = 0; gi.lex() != gi.lmax().val(); ++gi, ++rgi, ++c) {
+	    const String s1 = gi.stringMeta();
+	    const String s2 = rgi.stringMeta();
+	    EXPECT_EQ(rgi.lex(), c);
+	    EXPECT_EQ(s1 ,s2);
+	}
     }
     
 }
@@ -73,8 +125,6 @@ namespace
 int main(int argc, char** argv)
 {
     ::testing::InitGoogleTest(&argc, argv);
-    MPI_Init(&argc, &argv);
-    const int ret = RUN_ALL_TESTS();
-    MPI_Finalize();
-    return ret;
+    ::testing::AddGlobalTestEnvironment( new MPIEnv(argc, argv) );
+    return RUN_ALL_TESTS();
 }