Seems like editing user interface in Xcode is broken in latest fire release?
in Friday’s build? worked for me a few days ago. What’s the exact error you’re getting?
Nothing, Fire just blink as if will open Xcode and do nothing. Weird. Try in Mac book and Mac Pro.
Any messages in Console.app? does the project compile?
Fo you have a Shared Project referenced? Of so, know regression I repro’d this morning and fixed. may apologies. Of not, I’d still need to learn more details.