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?