thanks for the reply. I have upgraded to 2.3.3
the issue now works like this:
when you initially click on the convert to pdf link, it will work. once you click on this link a second time for the same post, it will give you a garbled versions of generate.php, rather than provide the opportunity to download a PDF document. I have been unable to understand what is happening after first use that is incorrectly handling the php file to generate another PDF, on the second click.