OK, so updated to Xcode8 sopent the majority of the day mopping up code to convert to new Swift3 syntax... things were looking ok.
Then I went to check out my Mian.storyboard. Things seemed to be loading then I get an error at top of the stroyboard interface saying "An internal error occured. Editing functionality may be limited" And nothing renders. Just blue boxes on the screen where items arte placed.
Is anyone having this issue? I have submitted a bug but now I am looking at downgrading Xcode.
Any help available?