Fixed 2D optimized CUDA grid traverser.

                 gridIdx,

                 gridEntityParameters... );

      }

      // only launches into the stream 0 are synchronized

      if( stream == 0 )

      {

         //cudaStreamSynchronize( s1 );

         //cudaStreamSynchronize( s2 );

         //cudaStreamSynchronize( s3 );

         //cudaStreamSynchronize( s4 );

      cudaStreamSynchronize( s1 );

      cudaStreamSynchronize( s2 );

      cudaStreamSynchronize( s3 );

      cudaStreamSynchronize( s4 );

      checkCudaDevice;

   }

   }

   else

   {

      dim3 cudaBlockSize( 16, 16 );