Copy command not writing complete data to text file

I am having some problems with the COPY... to FILE command - and I am
wondering if anyone has experienced similar problems in the past, and what
you may have done to resolve the problem?

The platform is Free BSD, Postgres version 7.4.5 and the program triggering
the COPY command is a CGI script.

I am copying out to a text files using PQexec - there are no more than 500
records in the tables being copied. What is happening, is one instance of
the COPY command is always stopping after dumping 16,384 bytes (16K) to the
text file - the last record is always truncated (i.e. the if the table has
20 columns, the last record may only have 7 columns in the flat file). There
is also no error returned in the program - to the program calling the copy
command everything gives an appearance of working.

What makes this problem difficult to resolve is that if I run the exact same
COPY command from the PSQL prompt, everything works with no problems.

Disk space is not an issue - there is sufficient memory to store the text
files many times over.

Has anyone else experienced similar issues, or can you point me to something
that may be causing this behavior to occur?

Thanks,

Kevin

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