I don't know when this started but it's basically brought my development to a standstill. I know it worked fine in macOS 13.2.1, though I didn't try Xcode 14.3 RC 2 in 13.2.1. Basically, Xcode 14.3 RC 2 (14E222b) and also Xcode 14.2 (14C18) (which had been stable up till now) are both unable to launch the app in debug mode. As soon as the launched/debugged app finally starts, the following is printed to Xcode's console: Message from debugger: The LLDB RPC server has crashed. You may need to manually terminate your process. The crash log is located in ~/Library/Logs/DiagnosticReports and has a prefix 'lldb-rpc-server'. Please file a bug and attach the most recent crash log. The crash log is always the same. The full log is at https://gist.github.com/NSGod/5e194900bd6f5a9ac9328b936a26037e. There seems to be an infinite loop in thread 6: Thread 6 Crashed:: <lldb.process.internal-state(pid=30877)> 0 LLDB 0x12030cfb4 ParseTrieEntries(....) + 20 1 LLDB 0x12030d653 ParseTrieEntries(....) + 1715 After I initially encountered this issue in Xcode 14.3 RC 2 (14E222b) with my business project, I tried creating a new Cocoa app using Xibs and Objective-C and still encountered the problem in that project. I've cleaned out the build folders, etc. but that made no difference. I opened both my business project and a new project in Xcode 14.2 (14C18) but saw no difference (it still crashes). I also tried in a new user account using both versions of Xcode but they both crash. Could having Python 3.10 and 3.11 installed through MacPorts anything to do with it (I noticed Python 3.9 in the binary images, but I'm not sure). Any ideas?