Using "Ignore Privileges": Fixing lost privileges after updating to Mac OS X 10.0.1; TrueBlue error fix

Two items involving the use of the "Ignore Privileges" option (see previous coverage):

Fixing lost privileges We have gotten a few reports of privileges/permissions to files being mysteriously modified after an update to Mac OS X 10.0.1. The result is that the user, even though logged in as an Administrator, cannot modify files to which an Administrator normally has access (such as files in the Applications folder). For example, the Show Info window may indicate: Owner "system" can Read & Write; Group "admin" can Read Only; Everybody can Read Only.

Pete Roberts solution to this was a standard UNIX one: from Terminal, use the <chmod> command in superuser mode to change the settings.

However, for those unfamiliar with UNIX, Stig Bjorge found another solution: Enable the "Ignore privileges on this volume" option in the Show Info window of the disk icon; then Restart. He could then modify the privileges of the problem folder (e.g., "Read & Write" for both the Owner and Group admin). He next selected to "Copy these privileges to all enclosed folders." After that, he could disable the "Ignore" option, restart, and all was well.

TruBlue error fixed Simone Manganelli claims that the "TruBlueEnvironment" error when trying to launch Classic (see previous coverage) can similarly be solved by disabling the "Ignore privileges on this volume" for the volume that contains the Classic software. Presumably, the user would have previously enabled this option, as it is disabled by default.

In general... Enabling (or disabling) this "Ignore privileges" option is a useful trick to try whenever you are having an unexpected privileges-related problem.