Vuforia UI & GUI elements not showing

Hi,
I am working on a simple Unity project using Vuforia. It consists on a character who has to jump different obstacles that keep spawning on the screen. To jump I use a UI button that needs a Canvas and, to show the number of obstacles that the player has jumped I use GUI text. Everything works well on the Unity editor. However, when I export it to Android no GUI or Ui elements show, only the character and the obstacles. I’m using Unity 5.1.0f3 and I’ve been searching for an answer some hours without getting any solution. Help, guys!

Damn, ran into the same problem.
I heavily suggest not putting canvas inside the image target.