This problem has hit me a few times now. For reasons I'm not yet aware of, my PC occassionally locks up and needs a reset. But when I do, I find that the MPL logs for the current day are missing.

I remember in v3 there was a tweak that controlled how often Plus flushed the logs to disk, the default was about an hour. Is there an equivalent in MPL? At the moment it seems MPL doesn't flush the logs at all until a conversation window is closed, and it never seems to flush the event log, so when I reset my PC I'm losing hours of logs.

Chat logs are flushed pretty often in Messenger Plus! Live: every 25 seconds and for that reason, it's not customizable anymore. If more of your logs are missing then something else must be happening on your computer.