Hello,
I still have a pdf with form fields that wpViewPdf shows incorrectly. I've tried with the lasts versions of wpViewPdf without success, so my clients have to use Adobe Reader to view them.
I've got a pdf invoice with form fields which is filled and flattened in runtime. When viewing it, two of the fields of the the first row of data move up and overlaps the headers (concretely CANTIDAD and LIN headers). The invoice shows correctly in Adobe and the other pdf viewer I am currently using.