Video stopped working in android App

Hi,

Im having trouble in using Adobe app for Samsung. I have a purchased PDF book with videos embedded within the booklet. I've had the booklet for a while and the videos worked fine (for over a year)until today.  I clicked on the "find in document" tool to search for the section i required, x'd out of the search tool before clicking on the video (i know video link won't work when search tool is open), however when I now click on the video link nothing happens.

It was working fine seconds before I opened the search tool before it stopped working. All other booklets are still working fine.

Any help appreciated