Since the last update we’ve been hearing a number of users report stability issues with highlighting text in PDFs, and the team has been working hard to identify the root cause. Refer this forum page for more information.
The team has been working closely with a number of our users to get test files, etc. as the issue was extremely elusive and almost never showed up locally. Thanks to the teams’ diligence and the outstanding help from our users, we have identified and resolved the issue in our latest version of Reader that we just released on the App Store. We’re also continuing to further strengthen the stability of the product as we go along.
You’re encouraged to update to the latest version on your iOS device, and as always, let us know if you see any issues.
Sr. Engineering Manager
Adobe Reader for Smartphones and Tablets