According to World of Apple:
Apple today gave a select number of developers access to the second build of Mac OS X 10.6.4. Build 10F50 includes a multitude of fixes and just one known issue.
Mac OS X 10.6.4 build 10F50 weighs in at 581.3MB in its delta form.
Included in this update
- Resolve an issue that causes the keyboard or trackpad to become unresponsive
- Resolve an issue that may prevent some Adobe Creative Suite 3 applications from opening
- Address issues copying, renaming, or deleting files on SMB file servers
- Improve reliability of VPN connections
- Resolve a playback issue in DVD Player when using Good Quality deinterlacing
- Resolve an issue editing photos with iPhoto or Aperture in full screen view
- Improve VoiceOver compatibility with iMovie and GarageBand
- Improve compatibility with some braille displays
Known Issues
- Marketing text is not formatted correctly, line returns missing.
Focus Areas:
- Graphics Drivers
- SMB
- USB
- Voice Over
- VPN