File stuck on flattening

Hi,

I have an end user who is attempting to print a .PDF file and continues to have issues. He has still not been able to successfully print this file in any capacity. 

File size: 65MB

Operating system on laptop: Windows 10 22H2 (10.0.19045.4291)

Licence type for user: Acrobat Pro 

Basically the steps that he takes are as follows: 

- Launches the Acrobat app

- Opens the PDF in question

- Zooms into a particular section

- Attempts to print the document

- Changes the view to "Current View" 

- Selects his printer

- Prints 

When he attempts to print the file, it starts to "Flatten" but it hits "Flattening: 9%" and then freezes - the entire Acrobat client locks up, and you wind up having to kill the task in task manager.

If he leaves it to sit it never seems to progress. 

I have had the user share the file with me and I was able to print it without any issues but I do note I am using Acrobat Reader and I'm also on Windows 11. 

Apparently his colleagues can sometimes print it. I couldn't get a clear answer there. 

I have also re-installed Acrobat (via Creative Cloud) but I have NOT re-installed C.C. 

I can't see it being an issue with the PDF or with the application itself, but I have no idea what the issue is. 

Any ideas?