Xcode not opening all files

Hi All,


Not sure what this is, but useing Xcode Version 9.0 beta 5 (9M202q) I open a project. If I then close the project by quitting Xcode, then open Xcode again, the project automaticaly re-opens. But some files are not listed in the left hand pain. If I then close thew project ( not Xcode) and then quit Xcode, reopen Xcode and project by clicking on theproject.xcodeproj file, Xcode opens with the project and the files are then correct.


It is surspected that the files that go missing are the ones added to the project after I start useing the Beta Xcodes.