Recently, I have started having an issue with vertical rectangles replacing text in my PDF files. I see this consistently when I try to combine PDF files. The files appear to be fine but after I complete the merge, the pages now have the vertical rectangles. The problem was reported a couple of weeks ago when my users reported what appeared to be "corrupt" pdf files. I have now discovered thaqt the problem is much more widespread than I suspected. I thought that I could just replace the corrupt pages, but when I replace the corrupt pages (or delete and then insert), the new pages will have the rectangles.
I have tried multiple versions of Adobe Reader and on a variety of devices.
Any help would be greatly appreciated.
Example listed above.