What operating system do you have?
You should know that Acrobat X is outdated and not compatible with the current systems, so problems with it are to be expected.
I am using Windows 10. No problems with Acrobat up until now.
I did find a solution though. Instead of comparing a span of pages in 2 large documents, I first make smaller files with just the pages I want to compare. That works.
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That's good, but be aware you might experience more and more issues as time goes by and the OS gets updated, while the application does not...
That will be hard when I absolutely hate all versions after X. Yes, I have tried them. I don't like how the program looks and works. Can't find half of the things I am used to use.
I will stick with it for as long as possible.
I can certainly relate to that... Good luck!