PDF turns black after editing.

I have had the program for 2 weeks. It was working well and then all of a sudden when I try to save a PDF after editing, the page turns black. Any thoughts?

Are you using Infix 5.28? If not, please download the demo again from our website.
If the problem persists, could you send me an example PDF before any editing by Infix and tell me what edits I need to make in order to reproduce the issue?

Yes, I am using the newest version. I will send you a PDF file to edit and save and then we can see if it does the same thing.