what is going on

I purchased this a while back and it work fine. Now suddenly, for no apparent reason, it wont open. When I go to the app store it says"update" but it wont do that either. I have tried to contact the publisher but, no response and I see on the message board plenty of other people have the same problem. BE CAREFUL! I wish APPLE would look into this. Not the type of problem you expect from an item in the App Store

RogerMal about Quick Note