I've found Excel OLE to be quirky like this. My pseudo subclass suddenly stopped working due to this error, I found it was because the order of operations had changed. I made sure the following global operations happened before any book level or worksheet level op. happened. 
    my $ex = Win32::OLE->GetActiveObject('Excel.Application') ||
    Win32::OLE->new('Excel.Application', 'Quit');

    if (not defined $ex) {
      die "couldn't get an instance of Excel";
    }

    $ex->{DisplayAlerts}=0;
    $ex->{SheetsInNewWorkbook} = 1;
    $ex->{Visible} = 0 ;

    $Win32::OLE::Warn = 3; # Die on Errors.

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In reply to Re^5: Win32::OLE called by subroutine only workes once by nll
in thread Win32::OLE called by subroutine only workes once by fish

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