When I first got the 4s I had no problems with viewing PDFs. I have not done an update and am still on 5.0. But now I cannot view any PDFs at all even trying to use iBooks it will not let me. I am sure if I update or do a restore it would probably fix it. I have already done a hard restart. Just wondering if anyone else has had any issues with viewing PDFs at all or if it's just me?