As rumoured yesterday Apple has delivered the first build of Mac OS X 10.5.5 to registered developers.

Build 9F5 of Mac OS X 10.5.5 is said to contain 83 bug fixes and addresses many issues that could cause potential kernel panic situations. Developers have also been instructed to focus on testing AirPort, FileSync, the Finder, graphics drivers, iCal, iChat, Networking, Text Services, Time Machine, and ExpressCard & USB modems.

The build comes with a warning to those who are running systems with integrated graphics cards not to install this build of Mac OS X 10.5.5. “Do not install on the following machines: MacBook Air, MacBook, Mac Mini, iMac (with Intel integrated graphics)”.