When I view some PDFs, a grey box with a red question mark inside appears. I cannot move, edit, or delete these boxes. I searched the web and most of the responses indicated that such boxes indicated corrupt images, but my documents do not have images. Mine appear at the start and end of text blocks. They do not appear in thumbnail view. I am running Acrobat Professional, version 8.1.
What are these boxes and how can I get rid of them?
Attached is a screen shot of what I am seeing.
How do you know that this document from 1959 is not a scan or partially scanned? Can you select individual words on the page? Questions can also come from fonts that are not properly embedded in the document. It is also possible that the fonts used in 1959 were not available when the tried to pdf the document?
I'm not sure what you mean by scan/partial scanned. This image was scanned from paper approximately 5 years ago. All the text on the page is OCR'd and I can select all the text, even that behind the grey boxes.I have other documents published at this time and scanned at the same time and these boxes do not appear.
I have also asked co-workers to look at this PDF and they are not seeing the boxes on their machine.
I've posted it to a workspace https://workspaces.acrobat.com/?d=5Is3lPcKyKtz6a45-ItZRw
In the version that displays in the workspace, I do not see the grey boxes. When I download that version, the grey boxes come back again. I have also tried viewing it from home with Adobe Reader X and still saw the grey boxes.
A little more info to follow up the excellent diagnosis.
When Acrobat opens a PDF and it finds annotations of an unknown type it shows these boxes. The way to get them to disappear (or change to something else) is to install a specific plug-in designed to show them.
Older versions of Acrobat would just show nothing at all.
Acrobat 5 would show nothing.
Acrobat 7 would show the boxes.