I'm seeing an issue with 10.8.2 (also had it with 10.8.1) where Messages will randomly fail to log some of my conversations. "Save history when conversations are closed" is checked in Preferences, but occasionally, the log will not be saved. I only use Messages for AIM contacts, so I am not sure if this also might happen with iMessages, Yahoo, Jabber, etc. The conversation itself happens normally, and when it's over, I close the conversation and it's removed from the left pane of the Messages window. But the next time I speak with that contact, whether by sending them a message or receiving a message from them, the immediately preceding conversation is missing from the conversation history (but the history does show older conversations that preceded the missing conversation). Looking in the Finder, there is no log file for that conversation in my logs folder. This happens only randomly and fairly rarely, from what I have noticed; it may occur once out of every 10 conversations. This has happened with a handful of different people and it's unpredictable, so it's frustrating to lose records of conversations with no warning and with no way to get them back. The workaround is just to leave every conversation window open, but that gets very cumbersome! I'd love to file a bug report, but I'm hoping to get some more information and perhaps figure out a pattern so I can give Apple some specifics. Has anyone else noticed this? Many thanks!