Hi Derekm,
Apologies for the delay in response, I hope you would be able to fix it by now.
If the issue still persists, as described above you are experiencing issues while saving the files, correct?
What is the dot version of the application installed? To check the version of the application you may refer to the link - Identify the product and its version for Acrobat and Reader DC
Please try to update the application to the latest version available 19.012.20036. Go to Help > Check for Updates. To know more about the latest version available please refer to the link - DC Release Notes — Release Notes for Acrobat DC Products
Let us know if that works for you.
Regards,
Amal