L4 has been crashing randomly on me all day, mostly while browsing passage lists or writing in a note file I've created. Doesn't seem to be more specific then that.
Just before crashing the computer seems to become busier (the fan gets louder), then L4 crashes.
0525.Logos4Crash.zip
So while I can't reproduce the crash based on a specific action, I'm starting to get used to expecting a crash before L4 has been running for 1/2 an hour.