Late Thursday, Apple seeded Apple on Thursday seeded its fourth beta of Mac OS X 10.6.5 to developers, as the security and maintenance update continues to be tested before its public release.

Per AppleInsider, sources familiar with the latest build, said to be known as 10H535, indicated that it features the same focus areas as the previous build, issued exactly one week ago Developers have reportedly been asked to concentrate on 3D Graphics, Mail, iCal, QuickTime, Time Machine and USB Devices.

The latest build is also said to have the same known issue as before, in which having VMWare or Parallels installed may prevent the use of devices connected to a USB port.

Stay tuned for additional details as they become available.