Thanks radzmar. Great suggestion to explore. I saved the original path/filename in text fields, saved the form, and emailed the link, closed the file. Immediately after opening the file from the link, I tried the saveAs() routine to save it to the path/filename stored in the form. Same error result ...

We have a  LiveCycle  XFA form that contains a "silent save" trusted function using doc.saveAs().  Users complete the form, save it, and e-mail it as an attachment with the JavaScript submitForm() function. One of the people who processes the form opens the e-mail, assigns specific processing duties...