Apple has released an update for Mac OS X 10.4 Tiger which it says will improve reliability and compatibility.

It has recommended the update for all users, which usually means it includes patches for several serious security holes but the computing giant is, as ever, being opaque about what those holes are.

The update varies in size from 27MB to 166MB depending on your Mac’s operating system and requirements, and it includes fixes for: Bluetooth wireless access; Core Graphics; Core Audio; Core Image; RAW camera support; Disk Utility; Spotlight indexing and searching; AppleScript; iChat; DVD Player; Safari applications; Dashboard widgets, Calendar and Stocks; Software Update and Sync Services; compatibility with USB and FireWire devices and third-party applications.

It also includes previous standalone OS X security updates.

It addresses an issue for Mac OS X 10.4.3 in which you cannot unlock the System Keychain, or the System Keychain does not accept your authentication when authenticating for a wireless network.

Safari now displays certain documents that have text/plain headers as plain text rather than treating them as HTML. Text within a nested HTML table's cells (such as a web-based form) no longer disappears when you click it. 10.4.4 addresses an issue in which some websites could cause CPU usage to spike unnecessarily, or cause Safari to stop responding, unless Safari's Enable JavaScript preference was deselected.

The update also resolves an issue in which Safari could unexpectedly quit if you tried to save a web page which includes an inline pdf file as a Web Archive.

A variety of widgets are included. iChat can now detect when you're using a Bluetooth headset as your audio device, and allows it to initiate a video conference with AIM for Windows. The update addresses an issue in which Preview or other graphic applications might be able to open an EPS format file, but would unexpectedly quit soon afterwards.