NGUI objects black color after build into phone

Hi,

I just started to use NGUI package and I am currently having some problems.

I previously have searched for an answer in the forum and stumbled upon this post. After setting the ambient lights in the Render setting, I build and run the application into my phone but in the scene all the objects are black in color. I have even tried to use directional lights and run the application again but to no avail.

Side note: I have a background sitting at depth 0 and several in depth 1 and several others in depth 2. Will this cause problems to the end result which I am having now?

Thanks in advance.

Edit

Here is my material

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And here is where I apply my material to the object

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Edit2

Here is my expected scene

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Here is the scene I get after loading into phone

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Edit3

Here is my Quality setting

[30152-screen+shot+2014-08-01+at+3.48.48+pm.png|30152]

Hi,

I did have the same problem with sprites (not NGUI) but than I realized that the texture atlas of the sprites has been very large (4096x4096). My Galaxy S3 could handle it, but my iPhone 4 could not. I did also get black sprites instead. Try to reduce the texture size if possible, and try it again. It solved my problem.

Hope it helps,

Jusabian