Saved Chats opened when the Main Messages window has actual chat still visible....
If the Save feature can't save the Chat in the "right order" then it is unlikely that the "history" feature of showing you the previous parts of the conversation are always going to be correct.
However the Combo Update page links to this
http://support.apple.com/kb/HT5730
To Quote (My Emphasis)
About the update
The OS X Mountain Lion v10.8.4 Update is recommended for all OS X Mountain Lion users and includes features and fixes that improve the stability, compatibility, and security of your Mac, including the following:
- Compatibility improvements when connecting to certain enterprise Wi-Fi networks
- Microsoft Exchange compatibility improvements in Calendar
- A fix for an issue that prevented FaceTime calls to non-U.S. phone numbers
- A fix for an issue that may prevent scheduled sleep after using Boot Camp
- Improves VoiceOver compatibility with text in PDF documents
- Includes Safari 6.0.5, which improves stability for some websites with chat features and games
- A fix for an issue that may cause iMessages to display out of order in Messages
- Resolves an issue in which Calendars Birthdays may appear incorrectly in certain time zones
- A fix for an issue that may prevent the desktop background picture from being preserved after restart
- A fix for an issue that may prevent documents from being saved to a server using SMB
- Addresses an issue that may prevent certain files from opening after copied to a volume named “Home"
- A fix for an issue that may prevent changes to files made over NFS from displaying
- Resolves an issue saving files to an Xsan volume from certain applications
- Improves Active Directory log-in performance, especially for cached accounts or when using a .local domain
- Improves OpenDirectory data replication
- Improves 802.1X compatibility with ActiveDirectory networks
- Improves compatibility when using mobile accounts
Messages remains at version 7.0.1 which came with the OS X 10.8.2 update.
7:58 PM Wednesday; June 5, 2013
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.3)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously