diff --git a/external/external_build.cmake b/external/external_build.cmake
index bc3fe95..a1878d9 100644
--- a/external/external_build.cmake
+++ b/external/external_build.cmake
@@ -7,7 +7,7 @@ SET(EIGEN_URL "http://bitbucket.org/eigen/eigen/get/3.1.4.tar.gz" CACHE URL "URL
 SET(GENGETOPT_URL "ftp://ftp.gnu.org/gnu/gengetopt/gengetopt-2.22.5.tar.gz" CACHE STRING "URL to download gengetopt from")
 SET(HDF5_URL "http://www.hdfgroup.org/ftp/HDF5/releases/hdf5-1.8.15/src/hdf5-1.8.15.tar.gz" CACHE STRING "URL to download HDF5 from")
 SET(NETCDF_URL "http://www.unidata.ucar.edu/downloads/netcdf/ftp/netcdf-4.1.3.tar.gz" CACHE STRING "URL to download NetCDF from")
-SET(BOOST_URL "http://sourceforge.net/projects/boost/files/boost/1.49.0/boost_1_49_0.tar.gz/download" CACHE STRING "URL to download Boost from")
+SET(BOOST_URL "http://sourceforge.net/projects/boost/files/boost/1.60.0/boost_1_60_0.tar.gz/download" CACHE STRING "URL to download Boost from")
 SET(GSL_URL "ftp://ftp.gnu.org/gnu/gsl/gsl-1.15.tar.gz" CACHE STRING "URL to download GSL from ")
 mark_as_advanced(FFTW_URL EIGEN_URL HDF5_URL NETCDF_URL BOOST_URL GSL_URL)
 
diff --git a/src/fortran.cpp b/src/fortran.cpp
index 679f409..716d57b 100644
--- a/src/fortran.cpp
+++ b/src/fortran.cpp
@@ -78,6 +78,7 @@ int64_t UnformattedRead::position() const
 
 void UnformattedRead::seek(int64_t pos)
 {
+  f->clear();
   f->seekg(pos, istream::beg);
   checkPointRef = checkPointAccum = 0;
 }
diff --git a/src/loadGadget.cpp b/src/loadGadget.cpp
index 9f77bb4..2642aac 100644
--- a/src/loadGadget.cpp
+++ b/src/loadGadget.cpp
@@ -51,8 +51,9 @@ using namespace std;
 void loadGadgetHeader(UnformattedRead *f, GadgetHeader& h, SimuData *data, int id)
 {
   f->beginCheckpoint();
-  for (int i = 0; i < 6; i++)
+  for (int i = 0; i < 6; i++) {
     h.npart[i] = f->readInt32();
+  }
   for (int i = 0; i < 6; i++)    
     h.mass[i] = f->readReal64();
   data->time = h.time = f->readReal64();
@@ -146,6 +147,7 @@ SimuData *CosmoTool::loadGadgetMulti(const char *fname, int id,
         f->endCheckpoint();
         blockTable[block] = f->position();
         f->skip(blocksize);
+        cout << "Got block '" << block << "', position = " << blockTable[block] << endl;
       }
     } catch (EndOfFileException&) {}