XCode 9 GM Candidate 1 is currently crashing when opening a storyboard.
ProductBuildVersion: 9A235
UNCAUGHT EXCEPTION (NSInternalInconsistencyExcepti
Easy fix:
Just put insetsLayoutMarginsFromSafeArea="NO" on and remove all from your storyboard source code.
insetsLayoutMarginsFromSafeArea="NO"
E.g: