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Showing translucent texture when detecting marker.

Hi, I am following VideoPlayback Sample project in Xcode. I set my own markers and Images and videos as well. Images and Videos are coming from Webservice. So all code working fine but sometime when  I upload image on CMS, on few Images it shows translucent Images on markers but not all Images. What I have observed after changing types and size of Images, It mostly show .png Image fine but not show .JPG(not all but few of them). I also change resolutions and dimensions of Image but couldn't get any hint that what exactly Image I need to uplaod to make stable output. Also it perform well on iPhone5(iOS6.1) and iPhone4S(iOS6.0) but only occuring issue in iPhone4(iOS4.3). I also update lates SDK of Vuforia on today. 

I attached screenshot of Images. On iOS 6.png it show proper Images but on iOS4.3 it shows translucent Image. 

Kindly guide me what and where I am doing wrong and also what is standard or guide lines for Image to show as a texture?

Thanks in advance. 

Cheers.

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