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People familiar with build 10C527f said the latest update has only one known issue, and has a number of fixes in 13 different focus areas. It also reportedly provides reliability improvements for iWork, iLife, Aperture, Final Cut Studio, MobileMe, iDisk, and Safari plug-ins.
The update also reportedly fixes a glitch that could delete user data. The problem is triggered by logging in and out of a guest account on a Snow Leopard machine. Upon logging back in to their regular account, some users may find that it has been wiped of all data. Apple acknowledged the issue earlier this week, stating it is working on a fix.
The latest build allegedly provides a number of GraphicsDrivers fixes, including resolutions for crashes with OpenCL, a screen flickering issue, and stuttering while playing 1080p content with QuickTime Player X.
The update is also said to resolve an issue that did not allow some QuickTime movies to play in QuickTime Player X.
A handful of iMovie-related issues were also addressed, including color shift issues and a crash that occurred when looping previews of titles in the skimming palette.
The update is a 483.5MB file, and is the third beta release in less than two weeks. The previous build of Mac OS X 10.6.2 was provided to developers on Oct. 9. The last build addressed nearly 150 general focus areas covering a wide range.
Released just days after the launch of Snow Leopard, Mac OS X 10.6.1 addressed printer issues, updated the Adobe Flash Player plug-in, and resolved issues with the Mail application, among other fixes.