Apple on Thursday seeded the third beta of Mac OS X 10.6.5 to developers, its latest security and maintenance update for Snow Leopard, with just one known issue.

Per AppleInsider, sources familiar with the latest build, reportedly known as 10H531, said the lone issue is associated with VMware and that having the software installed can cause USB devices to not work when the Mac is awoken from sleep mode.

The sources said said Apple has asked developers to focus on a few key areas for the latest beta, including iCal, Mail, USB Devices, QuickTime, Time Machine and 3D graphics. The delta update is said to be a 557MB download.

The latest beta comes just a week after the last build was supplied to developers. And the previous, first build arrived only six days before that.