By Prince McLean

Published: 12:00 PM EST

Apple Computer on Tuesday evening released to developers a new pre-release build of its Mac OS X 10.5 Leopard operating system, AppleInsider has learned.

The new distribution, labeled Mac OS X 10.5 build 9A321, includes only minor changes and enhancements from build 9A303, which was released last month.

In the accompanying documentation, Apple reportedly warned developers about unresolved Finder crashes when mounting AFP volumes and Active Directory quirks.

The Cupertino, Calif.-based Mac maker also acknowledged ongoing keyboard navigations glitches in the Dock and Expose. Similarly, a keyboard navigation issues with Spaces sometimes sends users to the unintended workspace.

Since introducing Leopard through a preview in August, Apple has remained relatively mum on when it plans to release the software to market. It has also been waiting on the release of Microsoft's Vista operating system before it divulges several "top secret" features which it has been keeping close at bay.

Apple chief executive Steve Jobs is widely expected to dish out some of those new features during his keynote presentation at Macworld Expo, which takes place next month in San Francisco, Calif.

For other Leopard news, please AppleInsider's recent report on the system's file recovery tools & Spotlight enhancements, Quicklook & Dashboard changes, new Safari tab & search features, resolution independence, OpenGL & QuickTime improvements, and Safari's anti-phishing measures.

Of course, the initial batch of publicly disclosed Leopard features is available as part of AppleInsider's WWDC Leopard coverage.