Late last week Apple seeded the first build of Mac OS X 10.5.6. The update will be the sixth update to Leopard since its retail release in October of 2007.

The update which is expected to be one of the largest updates to Mac OS X Leopard includes over 50 fixes in its first iteration. The build which is labelled 9G21 is said to weigh in at 350MB in its delta form.

Seed notes after the jump.

Known Issues

  • Automatic MobileMe syncing between Macs running 10.5.5 and 10.5.6 will not work; however, manual syncing works as expected.

Focus Areas

  • AddressBook
  • AppKit
  • AppleHWRaidUtility
  • ApplicationFirewall
  • AppleWWANSupport
  • ATS
  • Automator
  • Bom
  • BootCache 
  • Calculator
  • CFNetwork
  • Chess
  • CoreAudio
  • CoreFoundation
  • CoreGraphics
  • CoreServices
  • CoreTypes
  • DVDPlayback
  • Finder
  • Foundation
  • gnutar
  • GraphicsDrivers/OpenGL
  • HIToolbox
  • iCal
  • iChat
  • ImageCapture
  • Installation & Setup
  • IOSerialFamily
  • IOStorageFamily
  • Keyboard & Mouse
  • KeychainAccess 
  • KeychainScripting
  • LoginWindow
  • Mail
  • MobileMe
  • Networking
  • Network File System
  • OpenSSH
  • Parental Controls
  • PDFKit
  • Printing
  • QuartzComposer
  • QuartzCore
  • RAWCameraSupport
  • Safari: HTTP Cookies, HTTP Proxies
  • SmartCardServices
  • Spaces
  • Spotlight Syncing
  • System Preferences
  • TimeMachine
  • TimeZoneData
  • udf
  • Video conferencing
  • webdavfs
  • xnu

Areas of Change

  • Address books syncing fixes
  • AFP server login fixes
  • Graphic drivers performance fixes
  • New iCal Events and AppleScript applet fix
  • Safari and cookies compatibility fixes
  • Core Audio and AU component version mismatch fix
  • Multiple instances of MatrixReverb in separate threads fix
  • Core Audio compressor threshold fix
  • Switching default audio device’s output stream is now immediate
  • More channels for Core Audio 3D mixer
  • Programmatically created (public) aggregate device now plays correctly
  • Audio Channel Layouts and Unique ID fix
  • Changing the composition of an aggregate device audio dropout fix
  • kAudioSubDevicePropertyDriftCompensation property can now be set on an aggregate device
  • Renaming aggregate devices now propagate device name changes to all applications
  • AudioFileOpenURL memory management fix
  • CoreAudio AudioFileWritePackets file creation fix
  • audioqueue compatibility fixes
  • audio file stream compatibility fixes
  • ExtAudioFileCreateNew memory management fix
  • ADTS files now supports kAudioFilePropertyPacketSizeUpperBound
  • Core Audio performance fixes
  • CGDisplayBaseAddress and 64bit binaries compatibility fix
  • Command-H and applications hiding fix
  • FSCatalogSearch() on 64 bit binary app now returns correct results
  • iCalExternalSync floating events and stability fixes
  • iCal can now identify VTIMEZONE with a simple offset and no transition dates
  • Setting iChat setting to “invisible” via AppleScript now keeps you logged in
  • Embed ColorSync Profile” in Image Capture no longer leaves invisible file behind
  • Image Capture Architecture performance fixes
  • Show(Hide)Window() without Window menu memory management fixes
  • Linked binary with NFS shares fix
  • Keychain Access: Change Password now works for smart cards
  • AppleScript/Keychain Scripting now saves passwords as UTF-8
  • pthread operation support fixes
  • Access times on FAT32 formatted USB external drive performance fix
  • Fixed issue with large file (4gb+) writes to LINUX nfs server when initiated from finder
  • NFS export and hostname resolution at startup fix
  • copying from a framebuffer object to a texture via glCopyTexSubImage2D fix
  • GL_ARB_occlusion_query now works with multiple in-flight queries
  • Dealloc method of Cocoa PDE is now called when Print dialog is closed
  • Two-Sided Checkbox now follows PPD UIConstraints
  • Carbon Printing sheets and window flickering issue fix
  • ‘Collated’ can now be set as default in print dialog
  • Print sheet now honors first page/last page settings
  • PDFView now works with undoManager when its document is set
  • Paper sizes and some PPDs compatibility fixes
  • AERecord-to-NSDictionary translation now handles ‘usrf’ fields.
  • Support for serial smart card readers in pcscd
  • SyncServer performance fix
  • AppKit recognition of xml-format webarchives
  • Latest time zone changes for Brazil, Europe, Argentina, etc
  • Uploading of files to more than one webDAV volume at the same time fix
  • X11 application gnubg segmentation fix