Fixing “sandboxd: mdworker deny mach-lookup” errors

Since upgrading to Mountain Lion (a clean install of OS X 10.8) I’ve been getting occasional very annoying freezes on my macbook pro. They last about four seconds and then the freeze is over and all continues as before. No crashes in Console, but repeated errors like this that correspond to the freezes:

mdworker(21951) deny mach-lookup
kernel[0]: Sandbox: sandboxd(21946) deny mach-lookup

mdworker[21951]: Unable to talk to lsboxd

It seems that Jay Barnes at Princeton has a solution, and it’s not a hurty one like reinstalling the OS. Reboot in safe mode. Then reboot again. Seems too easy. Also makes me wish I had tried clearing caches with Maintenance.

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