permission

When using some common sandboxed applications in OS X such as TextEdit, you may run into an issue where the program experiences file access errors for which you may not even receive a notification. For example, if such an error occurs in TextEdit, you may see a warning stating that you do not have permission to access a file you are trying to open, or you may just find yourself unable to save a new or existing file you are currently editing.

In addition, access restrictions in sandboxed applications may result in odd file-saving behaviors in which multiple copies of … Read more

An apparent issue in the versions of OS X that are preinstalled on Macs shipping from the factory is causing headaches for some users, where they may run into problems if they try to reinstall OS X or restore from a backup.

As described by MacNN and MacTrast, the issue appears to happen because of a permissions problem that results in a compatibility error when the Mountain Lion installer is downloaded and run on an affected computer. Instead of installing as it should, users see a warning that states the current system is not compatible with Mountain Lion, with the … Read more

MacFixIt Answers is a feature in which I answer Mac-related questions e-mailed in by our readers.

This week, readers wrote in with questions about cleaning up a Mac to keep it optimized, external drive permission errors, increasing the number of recent documents stored in the system, and options for triple-booting OS X with Linux and other operating systems. I welcome views from readers, so if you have any suggestions or alternative approaches to these problems, please post them in the comments!

Question: How to clean up a Mac to keep it optimized MacFixIt reader Angel asks:

In OS X you should be able to create and manipulate files on your system largely without being burdened to authenticate, especially if the files are within resources your account owns such as your home folder. However, after upgrading or otherwise performing changes to the system you may find that the system continually prompts you for a password when you try to manage your files.

Sometimes this issue may occur only when you perform certain tasks such as deleting files (as opposed to placing them in the trash), but at other times it may happen on any manipulation.

OS X … Read more

All Mac systems should by default have at least one administrator account for installing programs and otherwise changing the system configuration and settings. However, there may be times, when after an OS upgrade or other major system configuration change, that the administrator privileges of an account might get stripped, leaving you with no way to change a number of system settings.

This occurs quite rarely, but if it does happen, one quick but well-known and convenient trick for recovering administrative status on a system is to activate Apple's OS X setup assistant again. This assistant is generally only used … Read more

Secondary volumes such as external USB and FireWire hard drives are often used with multiple computers, and if the drive contains a permissions-aware filesystem such as Apple's HFS+ (the default Mac filesystem) then it can inherit various permissions settings from the systems it's used with. While that's not usually an issue, these permissions can sometimes block access to parts of the hard drive so it can't be read from or written to.

To deal with this problem, Apple includes an option to ignore permissions on secondary drives, which can be invoked by selecting the drive and … Read more

Firefox is a powerful Web browser, in part, because of its support for plug-ins. Unfortunately, some of those plug-ins can cause problems with security and stability, especially if you have a lot of them. In Firefox 14, you can now configure plug-ins to load only when clicked. Seth Rosenblatt first reported on the feature with Firefox 14 Aurora. Now that the stable version of 14 (technically 14.01) is finally out, here's how to enable and use opt-in plug-ins in Firefox:

Enable opt-in plug-ins in Firefox

Step 1: In the address bar, type "about:config." When you … Read more

One of the commonly recommended maintenance routines in OS X for tackling system slowdowns and other performance problems or odd behavior is to run a "permissions fix" on the boot drive. This is done with Disk Utility, and because it will not hurt the system to perform it is often one of the first suggestions people offer for troubled systems.

Permissions in OS X are file and folder attributes that grant a specific user or group access rights to that file or folder. There are two types of permissions in OS X, the first being traditional UNIX permissions, … Read more

The hard drive on most Mac systems is one of the user-serviceable components of the system, so you can follow instructions such as these provided by Apple to access and replace the drive to upgrade it, or swap a broken one out for a working one. The replacement of the hardware can be relatively straightforward, but sometimes you might run into hurdles when accessing files in user accounts and other locations on the older drive.

While Apple offers options to migrate user files, accounts, and settings to the new drive either from the old drive directly or from a backup, … Read more