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My steps (on El Capitan 10.11.2): Deleted com.apple.desktop.plist- problem persisted Replaced /System/Library/CoreServices/DefaultDesktop.jpg (req. disabling System Integrity Protection here) - problem persisted Repaired permission for /System/Library/CoreServices/DefaultDesktop.jpg as detailed here - problem SOLVED (can choose new desktop image via Sys ...


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Yes, this is possible. See Apple's RoundTransparentWindow code example: This sample demonstrates how to create windows with custom shapes, no title bar, and transparent content. It also shows how to change the shape of the window and recalculate the drop shadow around the window border.



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