Having 2 versions, if they have not the same name, is not a problem in itself. Were those 2 version Release versions ? Which build number ? Or was 13 a beta or RC ?

Have you checked the info.plist ? It is by default : $(PRODUCT_BUNDLE_IDENTIFIER) Could you post it here as an attached file ?

Did you check Apple's doc: https://developer.apple.com/documentation/appkit/nsvisualeffectview There is this specific warning: AppKit views and controls automatically add vibrancy where appropriate. For example, NSTextField enables vibrancy to increase the contrast between the text and background. Don't change the vibrancy settings of standard AppKit views and controls.

Does the project compile ? If so, that means everything is there but not showing. Did you try to see in dark mode ? What do you get when you copy and paste this code into a plain text editor ? Apparently, all text in black is now white. Go to Xcode > Preferences > themes and check what is the color of Plain Text in your theme (probably default).

Did you see this thread, with some having similar problem on M1 ? With the advice to wrap the action to a dispatch to main queue. https://developer.apple.com/forums/thread/679558 You should file a bug report.

Are you using Unity ? Did you ask them about possible cause of crash ?

How much disk space available ? It should be at least 50 or even 60 GB before starting download.

Sure, Apple experts do bring a lot of value when they contribute. But this is a forum for developers, where Apple experts may help from time to time, but not an official channel. IMO that's fine this way. To get Apple support, we have to use Contact Us or burn a DTS ticket. This being said, non-reply in the forum is effectively a problem. Have you checked that you have closed all your posts for which you got a correct answer ?

Do you mean you want to hide whatever app is launched ?

Thanks for feedback. Please post answer here when you get it from Unity forum.

Where can I find the "info.plist?" When you open your project in Xcode, you will get it in the left panel (file navigator panel) Note it may be listed without showing the extension, simply as Info. You will find the real Bundle ID content in the Project Targets; select the project (at top of file navigator panel) and look for its Targets:

You access the object Library by: selection a View in Storyboard clicking on + Button at top right of Xcode window Button(s) will be listed here:

I want the menu bar to be hidden globally during the execution of this special app.  In that case,   NSMenu.setMenuBarVisible(false) should do the job (but you may have to disable actions if you have any shortcuts) What happens when you add this in appDidFinishLaunching ?

Strange indeed. Same behaviour in iOS. Where does this 1 in Hello1 come from ? Is it the 1 of True bool ? The reason is likely because t1 is not a String (or an AttributedString), but a Text view. It is even surprising that interpolation works. Probably, SwiftUI extracts the attributedText from the TextStorage of the Text View, and fails in some cases. I tried the following variation to illustrate: let t1 = Text("Hello").foregroundColor(.red) let t2 = Text("World").foregroundColor(.blue) let s1 = "\(t1)\(t2)" Text(s1) // Instead of -->> Text("\(t1)\(t2)") .padding() .frame(width: 200) I get a totally different result : That's worth a bug report or at least a contact to support team.

You have : elementKind: "header" Where did you define it ? Did you try replacing with: elementKind: "Header" Or simply UICollectionView.elementKindSectionHeader There was an interesting discussion on the forum a few months ago, if that may help: https://developer.apple.com/forums/thread/682570