I am trying in vain to add an iPad retina icon to multiple XCode 4.3.2 projects.
I correctly resize the image in an external program to 114x144 pixels, then I drag it into the "iPad Deployment Info" section of the "Summary" window in my project. An error message pops up to say that the icon size is invalid (see image) :

The file "/Users/max/Desktop/General Images/Camera/icns/114.png" does not match the required size. It must be 144 x 144 pixels in size.
I am absolutely certain that it IS the correct size, and seeing as I used to be able to simply drag-and-drop, and because it is happening in multiple projects, if this is a bug in XCode?
Please help me resolve this issue.
Thanks in advance,