I wrote a quick test script to try to apply a flock() to the database file, and it was successful, so the problem seems limited to my usage here. What could be going on?

sub build_consultant_data() {
    $dbh = DBI->connect("DBI:CSV:f_dir=$CSV_DATA")
      or die "Cannot connect: " . $DBI::errstr;    # Connect to the DB

    my $directory =
      $ua->get('http://www.somwhere.com/blah/blah/blah/')
      ;                                            # Get directory
    my $te =
      new HTML::TableExtract(
                            headers => [qw/Name Int Username Group/] )
      ;                                   # Set up for TableExtract
    $te->parse( $directory->content );    # Extract the pertinent data
    my $ts =
      $te->first_table_state_found()
      ;    # Create a table_state object to get at the rows

    $sth =
      $dbh->prepare(
               "INSERT INTO $CONSULTANT_TABLE VALUES (?, ?, ?, ?, ?)")
      or die "Cannot prepare: "
      . $dbh->errstr();    # Prepare to insert fields.
    my $i = 0;             # Initalize counter
    foreach my $row ( $ts->rows ) {    # Handle all the rows of data
        next unless @$row[0]; # Dump the row if the real name is empty
        my ( $ln, $fn ) = split ( /,/, @$row[0] ); # Extract last name
        $fn = ( split ( / /, $fn, 1 ) )[0];    # Remove middle name
        $sth->execute( $i++, $fn, $ln, @$row[2], @$row[3] );
    }

    $dbh->disconnect();    # Disconnect from the DB
}
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