On the Aeries Reporting Server, the Wingdings 2 font (wingdng2.ttf) needs to be installed to produce the check mark which displays on certain reports such as Standards Based Report Cards, otherwise, it will display as a "P".
A missing font could be the issue if a checked checkbox is displayed within Aeries, but it displays as a P when the PDF is printed.
Installing the font will translate "P" into a checkmark. This is a free font bundled with many installations of Microsoft Office or Windows.
Here is an example of what a report might look like with the font missing:
Here is an example of what the report looks like with the Wingdings2 font correctly installed, showing the box properly checked:
Note: With recent versions of Windows (Windows Server 2019 or Windows 10), by default, fonts get installed to the currently logged in user account only. To properly install fonts on these systems, right click Install for All Users to install the fonts rather than copying them to the fonts folder.
Note: After installing the font, the Aeries Reporting Service may need to be restarted, or the server may need to be rebooted to apply the change.