This issue has been fixed in Practice Management 11.3.5 hotfixes.
The hotfix file is available for download from the KA article Practice Management 11.3.5
Component Name:APS.PM.Correspondence.dll
Instructions for installing APS Hotfix files:
Download the Hotfix file\s from the KA article Practice Management 11.3.5
Extract or unzip the files to your APS Downloads folder or to a suitable folder in your network.
Ensure that all Advance applications are closed.
Copy and replace all the component files to the Adv2000 folder on every user's workstation and/or terminal server where aps is installed.
NOTE:- Some operating systems will block the DLL files by default. Prior to copying any files to Adv2000 please ensure that each file is unblocked first.