WebViewer Version:
PDFTron.NETCore.Windows.x64
6.10.6.71279
Do you have an issue with a specific file(s)?
No, the issue occurs against any file.
Can you reproduce using one of our samples or online demos?
Yes, we were able to reproduce the very same issue using the demo file downloaded from: https://showcase.apryse.com/
Are you using the WebViewer server?
Yes.
Does the issue only happen on certain browsers?
No, it occurs on any browser.
Is your issue related to a front-end framework?
Yes, we see the issue in the web browser console.
Is your issue related to annotations?
Yes, the issue occurs when we try to annotate a downloaded PDF.
Please give a brief summary of your issue:
Range Error: Maximum call stack size exceeded
Please describe your issue and provide steps to reproduce it:
We use PDF Tron in our system to annotate the uploaded PDFs. When users of our system try to save the annotated PDF they get the exception in the browser console and the PDF wouldn’t save.
Please provide a link to a minimal sample where the issue is reproducible:
We can prepare the minimal sample but thought that you may have a quick solution for us based on the details that we have provided 
Thank you for any support in our case - we are a little bit lost at the moment!