Today, for the first time, I got a new error message: "Error [IO subsystem]: End of Data reached" (attached).
Version: PDF-XChange Editor Plus 9.1.356.0 (portable) on Windows 8.1 x64.
This arose from a combination of steps, each of which I have performed individually in the past (many times, for some steps).
Here is the indicative sequence:
- Open PDF file (Read-Only). Editor reports the Application = "Acrobat PDFMaker 21 for PowerPoint" and the PDF Producer = "Adobe PDF Library 21.7.127". The document comprises PDF'ed PowerPoint slides with text content (structured as Container>Text) and then 'handwritten' electronic notes overlaid (structured as Path in the Content pane, so each individual curve is a separate content item). I have opened this sort of document from the same source several times before.
- Add some Comments using the Typewriter tool. I have done this many times, including with the same type of document.
- Save the document with a new filename. (I hit "Save" and it redirects to Save As.) I have done this many times, including with the same type of document.
- Add some more Comments using the Typewriter tool.
- Save the document.
- Add some more Comments using the Typewriter tool.
- Save the document.
- Copy (by thumbnail drag-and-drop) one of the middle pages (by now containing text, handwritten Path content, and Comments) to a position immediately following the original page. This I have only done occasionally, and maybe never with this type of document. I was originally going to insert an empty page, but avoided that for reasons described in an earlier post on this forum.
- Delete the majority of the handwritten handwritten Path content (by mouse selection) on the copied page. This I have only done rarely, but it has been with this type of document.
- Add some more Comments on the copied page.
- Save the document.
- Add some more Comments on the page following the copied page.
- Scroll up to the (by now modified) copied page. Surprisingly I noticed that only the Comments were displayed; the original text and retained portion of handwritten text were not displayed, although I'm pretty sure I had not deleted them.
- In Windows File Explorer made a copy of the last saved version of the file (at step xi)
- Attempted to save the document. Got the error message reported.
- Freaked out for a moment (although in the end it wasn't a major calamity, I was more worried by the possible implication of "IO subsystem" that the problem might be in the underlying file-system or hardware IO).
- Tried Save As with new file name or new path, but this produced the same error.
- Tried Save as Optimized. Hooray! This worked. (Cf. January 2021 forum post, linked below.)
I found a couple of other posts on this category of error message:
- January 2021: https://forum.pdf-xchange.com/viewtopic.php?f=62&t=35707&p=148501 [Pdf Structure Library] error possibly caused by 'bloated' layers.
- October 2021: https://forum.pdf-xchange.com/viewtopic.php?f=62&t=37452&p=154034 [IO subsystem] error possibly caused by copy & paste of stamp.
—DIV