Steps:
1. open a PDF normally, and edit it, such as by adding text or inserting pages
2. without saving or closing the open PDF, go to Finder, right-click and press command-P to print the PDF
3. the print window appears, with all of the in-progress edits
4. click "Cancel" and the PDF is closed, without saving the changes and without a warning about unsaved changes.

When printing a PDF from Finder, Acrobat should check whether the file was already open, and not close it if it was. If it does close the file, it should check to see if it has changed, and give the usual warning.

i download PDF notes from online institution for a regular basis. i got this error few months earlier which was like 1 in a 100 PDF files.i could not able to see the diagram in the file as well as couldn't print that either. i ignored but now i see it again even after getting the latest update available. i searched for a online solution but i think you never had solved this problem. do you know the funny think ,Chrome, Microsoft edge even a simple program can load that PDF file successfully but you..what a pity!!! i am posting every possible data to help you so that i can get help. please solve this issue.

some info about the PDF file:
i give online test and they let me download a copy of that paper and in which my Email id is watermarked so that i can share it anywhere else.

AutoCAD has an option to create a "wipeout" feature that you can place behind text to hide the drawing behind it. When creating PDFs from AutoCAD, it looks perfect while viewed as a digital copy. However, when end users (not the PDF creators) try to print these onto hardcopy FROM ACROBAT, the wipeout areas appear shaded, hatched, or solid black. This is not an issue with AutoCAD, as they print out correctly from the source. It is a compatibility issue that needs to be a collaborative effort between Autodesk and Adobe. This has actually been a problem for years, and has never been fixed. Please contact Autodesk to collaborate with them on a permanent solution, as workarounds are not an option for the hundreds of unknown end users that may want to print something out after we submit it in PDF format.

One task I need to perform frequently in my job is to search 1,000+ page documents for certain keywords, then save to a file JUST those pages with that keyword.

I had been doing that by using Advanced Search with the keyword, identifying particular pages to print and typing the page numbers into Notepad as I went along, such as "250-255,260-263,266,270-276,278,281,287,290-294,302,304,305,307,309,311-320,322,333,334,337-339,343-347,355,357,370-372,379". Then I would paste that string into the Pages box in the Print dialog box.

But, come to find out, Acrobat has been TRUNCATING that to 100 characters, WITHOUT telling me. It would just go ahead and print fewer pages than I wanted.

You can reproduce the problem by finding a 400+ page document, copying and pasting the above string of page numbers into the Page field, and printing (presumably to a file).

Please:
(a) Fix Acrobat so that if one tries to paste too many characters into the Page field, it issues a warning.
(b) GREATLY increase the number of characters accepted in the Page field, such as to 1,000.