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Tracking works better on second app run

Hi there, I've searched for my issue in all forum but I don't find anything about this. If there is some other subject about this already open please tell me, and sorry.

 

Using:

- Unity 5.0.4 and Vuforia 4.2

- 6 Image targets simultaneos possibility. All set as EXTENDED TRACKING

- Center set as CAMERA

- Android and iOS do the same.

- I have adjusted the DEFAULT TRACKABLE BEHAVIOR script to only acept all the others 5 images if the first specific one was found.

 

The problem:

When I open the app for the first time, the first target works fine and keep always in position, but all the others target when extended activate, floats without respect the position.

With the same APP when I return to menu and then open again the AR Level, all works fine. This time, the first and all others when extended activates (I mean the camera loses the target) all loaded objects respect it own position.

When I close the app and repeat the process, everything happens again in the same way.

 

So, if works fine in second run, what may happening in the first run that mess up?