TEXT_IO.PUT_LINE resulting in partial file at a consistant size of 40KB

Overview:
In client server mode the report opens a file on the desktop, writes a tab delimited text line for a specific repeating frame and then closes the file. However, the resulting file is incomplete but the previewer displays the compete report with no error. The first 40K contains text lines that are OK and then the output just stops at one line at the 40K threshold even if I change the data model query to select different data. This appears to be a max size buffer size but I'm not sure. I know that the UTL_FILE on the database contains a FFLUSH function but no such function exists for TEXT_IO. Hum...
Any ideas?
Report Text_io steps:
1. After Form trigger:
s_file.out_file := TEXT_IO.FOPEN('c:\temp\output_file.tab', 'W');
2. Repeating frame format trigger:
buf:='';
buf:=to_char(nvl(:QTY,0))||CHR(9);
buf:=buf || to_char(nvl(:M_PRICE1,0))||CHR(9);
TEXT_IO.PUT_LINE(s_file.out_file,buf);
3. After Report trigger:
TEXT_IO.FCLOSE(s_file.out_file);

I seem to recall having a similar problem. I thought it was that the after report trigger was not firing properly (i.e. at all).
I solved it by putting a field at the end of the report (outside the topmost repeating frame) and attaching the code to that

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