People familiar with the ongoing testing process for Mac OS X 10.5.1 Update say the new build, labeled Mac OS X 10.5.1 build 9B16, was accompanied by a note to developers that specifically mentions a Finder-related fix affecting files that are moved between directories.
It was widely reported earlier this month that Leopard's Finder is affected by a glaring bug in its directory-moving code, which could lead to horrendous data loss if a destination volume disappears while a move operation is in progress.
Those people familiar with pre-release builds of Mac OS X 10.5.1 also added that the software update will deliver an enhancement to Leopard that will allow Apple's Software Update and installer applications to make revisions to application files which may have been moved outside their designated "Applications" directory on Leopard volumes.
As was the case with build 9B13, which was released for private testing last Monday, Apple is reportedly asking that its developers test the latest build broadly, paying particular attention to Time Machine, Mail, iCal, Back To My Mac, Bonjour, AirPort, gaming graphics, networking and the Finder.
Mac OS X 10.5.1 is expected to be released as a free update within a few weeks' time.