As reported yesterday, the sixth developer beta for OS X 10.11 El Capitan has given way to a fourth public beta, available to pre-registered testers who signed up through the Appleseed program. Both of the recent betas, which share the build number 15A244d, are said to have very minor tweaks and under-the-hood fixes, including a new General icon in System Preferences, and at least one new wallpaper. Some notable flaws remain unaddressed, however.
