Just delete and re-download!
I have used Stick Pick the last 3 years in my grade 1 class. I have also shared it with many colleagues. When I went to add this years students and kept having problems, I freaked but remembered that I could email the developer. Buzz got back to me right away and told me because of an issue with Dropbox, all I needed to do was delete the app and re-download it. Problem solved, and I am back tons using this fabulous app. Dont listen to the naysayers. I use this app everyday!!
Tchrtvlr about
Stick Pick, v1.10