CoreServicesUIAgent Hangs After Gatekeeper verifies Xcode betas

Originator:nik.fletcher
Number:rdar://24344285 Date Originated:2016-01-26
Status:Open Resolved:
Product:OS X Product Version:10.11.3
Classification:Bug Reproducible:Always
 
When launching a new beta of Xcode from the Finder, Gatekeeper verification is triggered. Given the recent scares with dubious versions of Xcode, I prefer to leave Gatekeeper to do its thing, instead of manually removing the quarantine xattr via Terminal (even though I only ever download Xcode betas from the Apple Developer website).

When the progress bar completes, the OS X window asking me to confirm whether I want to open Xcode is shown. I choose “Open”, at which the beachball is shown and CoreServicesUIAgent is shown to be non-responsive for ~3 minutes. The confirmation dialogue remains onscreen during the beachball.

Force-quitting CoreServicesUIAgent and re-launching Xcode (rightly) forces a new Gatekeeper verification.

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