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The DXF2SHP plugin fails include the elevation information of a LWPOLYLINE entity when saving the data.
The file dl_dxf.cpp needs the handleLWPolylineData function updated to the allow for processing the groupCode 38

eg the following should work:

• Handles additional polyline data.
  /
  bool DL_Dxf::handleLWPolylineData( DL_CreationInterface /*creationInterface*/ ) {
  // Allocate LWPolyline vertices (group code 90):
  if ( groupCode 90 ) {
  maxVertices = toInt( groupValue );
  if ( maxVertices > 0 ) {
  if ( vertices != NULL ) {
  delete[] vertices;
  }
  vertices = new double[4*maxVertices];
  for ( int i = 0; i < maxVertices; ++i ) {
  vertices[i*4] = 0.0;
  vertices[i*4+1] = 0.0;
  vertices[i*4+2] = 0.0;
  vertices[i*4+3] = 0.0;
  }
  }
  vertexIndex = -1;
  return true;
  }

// Add the elevation as the z point to the vertices[]
  else if ( groupCode == 38 )
{
    for ( int i = 0; i < maxVertices; ++i )
  {
      vertices[i*4+2] = toReal(groupValue);
    }

}

// Compute LWPolylines vertices (group codes 10/20/30/42):
  else if ( groupCode  10 || groupCode  20 ||
            groupCode  30 || groupCode  42 )
{

if ( vertexIndex < maxVertices - 1 && groupCode == 10 )
{
      vertexIndex++;
    }

if ( groupCode <= 30 )
{
      if ( vertexIndex >= 0 && vertexIndex < maxVertices )
  {
        vertices[4*vertexIndex + ( groupCode/10-1 )]
    = toReal( groupValue );
      }
    }
    else if ( groupCode == 42 && vertexIndex < maxVertices )
{
      vertices[4*vertexIndex + 3] = toReal( groupValue );
    }
    return true;
  }
  return false;
}