I used to save PDF with extracted Text from Illustrator using the overprint and transparency flattener options
without any problem till yesterday.
yesterday I cleaned up my PC using AVG PC TuneUp 2014 since that action I couldn't export anymore from Illustrator as extracted PDF text file. the overprint and transparency flattener options is disabled as shown hereunder
I tried to restore all what AVG TuneUp did but nothing happened, and I get a dimmed dialogue box. And I have noticed that all software that have this option is disabled too, like indesign. I also tried to rest all software settings to its first installed settings as usual ways but i get nothing.
my Question is how to restore or re-activate the "overprint and transparency flattener options" ? I am using Acrobat 11 over Windows 7 ultimate and Creative Suite CS6
Note: This is not a graphics design issue, it is a technical issue.