— -- I think the white bar thing is actually something to do with how you configure the SplashScreen plugin, and might be related to the specific version of that plugin, as well. Unfortunately, nobody has ever shown us a good visual of precisely what you mean by the "white bar on startup" -- I've never seen it and it would help to see it in action (for instance, a video of what happens or a sample APK that I could install and run so I could see it).
As a guess, try adding these options into your intelxdk.config.additions.xml file:
<preference name="FadeSplashScreen" value="false"/>
<preference name="FadeSplashScreenDuration" value="0"/>
That fade splashscreen thing is screwy and causes odd stuff on my test apps. It might be what you are describing, or it might not, I'm not sure, since I don't really know what this "white bar" thing looks like.