Sprites and textures appears black on Samsung Galaxy Grand I9082

Info: Unity3D version v4.5. Vuforia Unity plugin v3.0.9.

This problem occurs on Samsung Galaxy Grand I9082, it works fine on Samsung Galaxy S4, Note 3, S3 mini, HTC One M7 and several others.

So I have two scene: Scene A: Main menu with standard unity sprites and textures. Scene B: Using AR camera from vuforia to show AR Objects.

Scene A is first loaded and works fine. Several sprites and textures appears black after changing from scene B to scene A.

We tried to reduce the max texture size to 1024, the problem is gone in the first few loads but still occurs after changing scene multiple times. Sometimes all TextMeshes also appears as blocks.

Screenshots: https://www.dropbox.com/s/lv01c6afl734fy0/Screenshot_2015-02-25-13-45-39.png?dl=0 https://www.dropbox.com/s/if5azedwoyplysn/Screenshot_2015-02-25-13-45-59.png?dl=0 https://www.dropbox.com/s/nke1dhmkid0wzjr/Screenshot_2015-02-25-13-46-35.png?dl=0 https://www.dropbox.com/s/odmf5hc8djqb2d0/Screenshot_2015-02-25-13-53-44.png?dl=0

What causes this problem? And how can I fix it?