Running Xcode 13.2.1 in Monterey 12.2.1
I have an Objective-C project where Xcode will suddenly not open an editor for the xib files. If I double click them in the finder with the project NOT open, they open in the editor. The project file also only opens as text.
Other Swift projects are fine.
The app will still build and run but I cannot make interface changes!
Previous suggestions about copying xib files etc have not helped. Restart and reboots have also not helped.
Suggestions appreciated!