Can't select and mark-up some of the text of a PDF in Preview.app
I downloaded the file from the web and have been able to add highlight to the file then and saved the file with Preview (including highlight). Now I can't even select most of the text of the PDF. For example, I can't select the text that I have previously highlighted. Basically, I can't select any paragraph-type text. However, I can still highlight the titles as well as headers and footers.
It looks like I have all necessary permissions on the file.
Does Preview create files that it can not edit afterwards?!
Any idea on what is going on?
Thanks!
MacBook, Mac OS X (10.5.6), Preview 4.1