Apologies about the image. I thought this had been done (it shows up in the screen I am looking at). As for the your question:
Under Acrobat->Preferences , the "View documents in PDF/A mode:" is set to "Only for PDF/A documents". As an experiment, I changed this setting to "Never." I then closed and opened a file with no difference in effect. I then exited and reentered Acrobat and all appears good!
First, thank you.
Second, what happened? I was able to markup files yesterday and not today. What could happen to change this setting (and I did not do this)?
Here is the original image:
Re: In Adobe Acrobat X (10.1.2) Markup no longer available