Apple has released an update for its Mac OS X Leopard operating system here . The update is called Mac OS X 10.5.3, and includes general operating system improvements that enhance stability, compatibility, and security of your Mac. The patch is claimed to fix 70 issues related to the OS that affect applications including AirPort, Automator, iCal, iChat, Mail, Parental Control, Spaces, Time Machine, and Voice Over.

The patch fixes the following issues:AirPort
Improves 802.1X behavior and reliability.
Improves reliability when using Time Capsule.

Automator
Resolves an issue in which "New iCal Event" may not work.
Resolves an issue that prevents work-flows from being saved in the Finder's contextual menu.
Fixes an issue in which "Copy Files" does not reliably work when added from Automator's warning dialog.

iCal
Addresses reliability issues with meeting alarms, invitations, and attachments.
Resolves issues with reliability when restoring from iCal back-ups.
Fixes accuracy issues with auto-completion, availability of data and location names.

iChat
Addresses reliability issues with screen-sharing.
Resolves an issue in which saved chat transcripts may be reported as "still in use" after opening and closing them in iChat.
Resolves an issue with group chats not being indexed in Spotlight.

Mail
Resolves an issue in which Mail may prevent idle sleep when set to automatically check for new messages every minute.
Fixes an issue that could occur if two compose windows are open when dragging a file to the Mail icon in the Dock.
Fixes issues with certain Web pages appearing garbled when emailed from Safari.
Fixes an issue in which Sent, Drafts, and Outbox mailboxes incorrectly list the "cc" recipients in the "To" column.

Parental Controls
Addresses performance issues with Web content filters.
Fixes an issue with managed accounts in which iChat transcripts may not be created.

Spaces
Resolves an issue in which switching to a different space and returning back to the original space may reorder the application windows with a different active window.
Resolves an issue in which activating an application from the Dock switches to a different space, even if there is a window for that application in the current space.
Fixes an issue in which the Command Tab may incorrectly switch to a new space.
Addresses reliability issues with Spaces when syncing preferences over .Mac.

Time Machine
Addresses reliability issues when performing a full restore from a Time Machine backup.
Fixes an issue in which certain function keys may be disabled after using Time Machine.
Fixes a possible alert message that incorrectly states a back-up volume does not have enough space.

VoiceOver
Includes Braille Update 1.0, which enables GW Micro, HandyTech, HIMS, Nippon, and Papenmeier Refreshable Braille displays.
Addresses an issue with Braille dot 7 and 8 underlining.
Fixes an issue in which HTML page anchors may be ignored by the VoiceOver cursor.
Fixes an issue that prevents Hot Spots from being used in text areas.
Resolves an issue with spell checking in which VoiceOver may only announce the first misspelled word if there are multiple words spelled incorrectly.