After altering a PDF form template in a program, why does Adobe Reader want to save the file when viewed later? [closed]

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In the program I'm working in, a PDF form is used as a template to generate reports. Once we're done filling in all the information using ABCPDF, the PDF is flattened and then attached to an email. When the final form of the PDF is opened in Adobe Reader, everything looks fine. Then, when Reader is closed, it asks if you'd like to save the changes you've made.

Why does this happen when no changes have been made since opening the file in Reader? My one guess is that it assumes a form with filled-in fields has changes in it.

Answer 1

It seems to me that your files are getting corrupt at some point in your workflow. When Acrobat Reader loads a file, and it finds invalid structures in it, it tries to "repair" the file by reading whatever can be read from it, then it prompts the user for saving the "repaired" version.