Xcode 8 Beta 4 - Comment Shortcut Disabled

Question

I fixed it following the steps here: https://twitter.com/kolpanic/status/763323546814844928

In Terminal: sudo /usr/libexec/xpccachectl

Reboot your system.

If Cmd-/ still doesn't work in Xcode 8 on an OS X 10.11 (and apparently on a macOS Sierra - thanks to @DanBlakemore), and sudo /usr/libexec/xpccachectl and a reboot didn't help, try the following.

1. Close Xcode.
2. Open /Applications in Finder, and rename Xcode.app to Xcode2.app (or any other name).
3. Rename it back to Xcode.app, and relaunch.

It should work now.

The problem seems to be that for whatever reason the system "uninstalls" Xcode extensions at some point, and won't "install" them again. This can be checked by opening Console, and grepping for INSTALL. If you have INSTALLED/UNINSTALLED for com.apple.dt.XcodeBuiltInExtensions, it won't work if UNINSTALLED was the last action on it, and will work it if was INSTALLED.

Figured this out when debugging an Xcode 8 extension.

The script mentioned above didn't work right away for me. I had Xcode 8 and 8.1 GM installed and was working with both of them off and on. I ran the script in the terminal, restarted my computer, opened Xcode and it still didn't work. So then I created a new directory in Applications and moved the GM into that directory. That seemed to fix it.

TL;DR If you have multiple versions of Xcode installed:

• Run in terminal: sudo /usr/libexec/xpccachectl
• Restart your computer
• Create a new directory in Applications
• Move the other version into that directory
• Restart Xcode and enjoy!

As explained there, here's a solution that doesn't require a reboot:

1. Close Xcode
2. In the Application folder, rename Xcode.app (or similar) to Xcode2.app. You might need to type in your password.
3. Open Xcode, then close it.
4. Rename Xcode2.app back to what it was before.
5. (Optional) Spend 5 minutes wondering why this worked.

Just update to Xcode8 release, then open Xcode8 and restart Mac.

https://developer.apple.com/library/content/releasenotes/DeveloperTools/RN-Xcode/Introduction.html

To use the Editor's Comment/Uncomment Selection and Add Documentation commands—as well as other installed Xcode Extensions—on OS X version 10.11, launch Xcode and install additional system components, then restart your Mac. (26106213)

Go to App Store, check for system update(iTunes, MacOSX). Update all of them.

It should be fixed once its done.

I rebooted, now it is working.

Then when I started beta 4 it asked me to "install required components" a second time. Don't know if related or not.