iOS playgrounds always crash

Originator:garth
Number:rdar://22114248 Date Originated:03-Aug-2015 08:01 AM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode 7 beta 4
Classification:Serious Bug Reproducible:Always
 
I’m not sure when iOS playgrounds stopped working for me, but opening one is now consistently producing a back-end crash. The “running…” spinner shows for about 5 seconds, and then the playground reports "Playground execution terminated because the process stopped unexpectedly." 

This happens even for newly-created playgrounds. OS X playgrounds seem to be OK. 100% reproducible.
 
I've tried deleting Xcode's derived data folder, but that didn't seem to help. I also reinstalled Xcode 7 beta 4 from the dmg file, same behavior.

Please let me know if there’s any additional info I can provide.

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