Please see response from Dawson regarding this problem:
“Sorry for the inconvenience that this is causing. Unfortunately since Adobe made a change to the Adobe Acrobat app for iOS this has caused this issue.
Adobe have advised that a new version, that will include a fix for this issue will be released between 8th Mar, 2016 – 15th Mar, 2016.
Apologies that we can’t do anything about this until Adobe fix the issue.”