I had this problem with the application, and when I went to edit the Info.plist file, I found that Default @ 2x.png was in the list of icons - I donโt know how it happened, but this project went on for a while, so this may be the result Too many Xcode updates.
Removing it from plist entries also fixed the problem on the retina of the iPad. I'm still going to add additional iPad icons just in case, but if others have a problem, it's worth checking what Xcode has placed in these entries.
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