When I upgraded to Sequoia 15.1, an app that worked fine under OS 14 stopped working. Out of 4 views on the main screen, only 1 is visible. Yet, if I click where another view should be, I get the expected action so the views are there, just not visible. Only I can't see where I am clicking!
I had to upgrade to Xcode 16 to recompile the app and run it in Debug mode. When I do, I get the following:
NSBundle file:///System/Library/PrivateFrameworks/MetalTools.framework/ principal class is nil because all fallbacks have failed.
Can't find or decode disabled use cases.
applicationSupportsSecureRestorableState
FWIW - the only view that actually shows up is the last subview added to the main view.