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I had the same issue, and it seems like a whole bunch of images were deleted during a previous commit. So I recovered them and copied them into my resources directory:

OUIFilePickerBackground-*
OUIToolBarButton-*
OUIDocumentDelete
OUIDocumentDuplicate
OUIDocumentExport
some other toolbar buttons

see: [r159239] Lots of iCloud work, document picker performance/animation, fixes merged from internal branches
commit: 7530108