Apple announced the Developer Preview for OS X 10.8 Mountain Lion back in February, and the company continues to iterate the software in anticipation of its summer release. The third version of the preview has now been made available to developers, but it appears to contain more than a few issues. 9to5Mac has the full release notes, which mention everything from FileVault issues that can prevent users from being able to log into their machines to brightness settings inconsistencies. There's even a noted problem with Java applets potentially not being able to run in Safari, though given the recent Java-derived vulnerabilities on the Mac some might consider that a good problem to have. It's a grab bag of bugs across multiple feature sets, making it clear that Cupertino still has quite a bit of polishing to do before releasing Mountain Lion into the wild. There's no mention of any new features that have made it into the build, but we'll be sure to let know when any surface.