Has anyone been successful in using Xcode 8 beta 5 to build and run a watchOS 3 app on an Apple Watch? I always get "Preparing to Install <appname> WatchKit App.app..." forever. I believe it was working around Xcode beta 3 but definitely not in beta 4 or 5.
From Xcode beta 5 release notes:
Build and run may not launch or attach to the app on Watch. Workaround: Change the watch face. (27019191)
I tried this voodoo with no luck.