My entire OS froze twice (rebooting required) with L4-B5 running in the background and Safari in the foreground. No other app running. I activated Logos Log Scribe after the second restart. Don't know if they contain anything useful or not, but here are the logs.
4505.LogosLogs Jack Caviness 20110121-171238.gz
I haven't tried running B5 since, so I do not know if this is repeatable.