I can not tell you if this works on this app but another app did the same. Seems their update was not so good and I found that if I cleared the app's data it would work again.
Here's the article I used. http://www.androidcentral.com/android-201-how-and-when-clear-app-cache-or-data
To be clear I had rebooted the droid and if the app was running I stopped it then tapped the CLEAR DATA button.
This is not a for sure cure but something I've learned to try.