When you write back to the .xfdf file, do you check if operation completed successfully or failed?

>I have a client list of 1000 clients. Everyone gets a printed PDF tax form filled in with their information.
>
>I fill the forms using the following procedure:
>I create an .xfdf file from the pdf using Nuance PDF Professional 5.
>For each client,
> I get the original .xfdf file.
> I convert the .xfdf file to a string.
> I stuff the string with all the client's information.
> I convert the string back to an .xfdf file.
> I print the .xfdf file.
>
>
>The problem is while the reports are printing, every now and then, a client record will get skipped and I'll get a dup of a client record that's aleady been printed. Maybe 3 dups in a row of the same client record.
>
>What's happening that's causing the skipping?
>
>Would it be a good idea to run it on a much faster machine to see if I still have the problem?
>
>Any other suggestions?
>
>Regards,
>Deb