Segmentation error at the end problem

[Charles Hixson]

Main routine:

void    main()
{
   try
   {  BlockFile bf;
      bf  =  new BlockFile ("test.bf", 4096);
      writefln ("before close");
      bf.close;
      bf  =  null;
      writefln ("after close");
      BlockFile cf  =  new  BlockFile ("test.bf", 4096);
      writefln ("after second open");
   }
   catch (Exception e)
   {  writefln ("Caught Exception ", e);  }
}
Results in:
Exiting BlockFile::this
before close
after close
Exiting BlockFile::this
after second open
Segmentation fault

I could post all the code.  It's only 146 lines.  But perhaps this is 
enough?