New version of app displaying previous version's assets

Ok,  Here is a weird one…

I have a previous “official” production version of my app on my iPad Air that was downloaded from iTunes.  After installing the latest development version on the iPad Air via Xcode and “upgrading” the app, the app is showing “some” of the assets from the previous version.   This only happens on some devices, namely iPhone 5 and iPad Air.  The older devices I have, iPod Touch 3rd gen and iPad 2 upgrade just fine.

Keep in mind these are bundled assets (png’s and image sheets), not user created ones.

Also,  if the original App Store version is deleted from the device first and then the new version installed, the new version works just fine.

The iPhone 5 and iPad Air shows different “previous” assets.  On the iPhone 5 the old Default.png is displayed when app firsts starts.  On the iPad Air, it is an image sheet from the previous version that is loading.

Not sure if this is some kind of caching issue.  I have completely shutdown both devices and restarted to see if that would make any difference but it doesn’t.  

This is happening when I upgrade a production build to a more recent development build.  The concern I have is that this will happen to users after the latest version is pushed to the app store and people start to upgrade.

This happening to anybody else?  Thoughts?

I am using build 1244.  

I may try renaming the image sheet to “force” the app to use the correct one.  Not sure what to do with the Default.png though.