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Two classes in my sandboxed application need to export a NSDictionary as a plist file. On the Capabilities, the Permission/Access setting is read/Write for User selected files. I use XCode 10.11.1 on Mojave, and build for ≥10.12. From several classes that need to export files, two are very similar and manage NSDictionary. For those two, when the user prompts for save, I open a NSSavePanel to choose the destination filename and directory. I use exactly the same code for my two classes: NSSavePanel *panel = [NSSavePanel savePanel]; [panel setNameFieldStringValue:newFilename]; panel.extensionHidden = TRUE; [panel beginWithCompletionHandler:^(NSInteger result) { if (result == NSFileHandlingPanelOKButton) { NSURL *saveURL = [panel URL]; NSString *savePath = [saveURL path]; if (![[savePath pathExtension] isEqual:@"plist"]){ savePath = [savePath stringByDeletingPathExtension]; savePath = [savePath stringByAppendingString:@".plist"]; } [exportDic writeToFile:savePath atomically:YES]; } }]; What is strange is that saving this ways always works for one class that use this code, whereas it doesn't succeed for the second class, except one non-reproductible time! I got no message on the debugger console, but I can see one in the Console application: Sandbox: MyApp (xxxx) deny(1) file-write-create my_file_path.plist I verified everything, reset the sandbox setting, clean build folder, quit/relaunched Xcode, and even rebooted the computer several times. Any idea? Thanks