Logos had been setting idle for about 5 minutes when it suddenly disappeared from the screen. Restarted and sent crash report to Logos.
3821.Apple Crash Report.rtf
6457.LogosLogs.jackcav.20131115-082732.zip
When I had quit Logos normally earlier this morning, Apple reported that it had quit unexpectedly, and Logos requested a crash report upon restart. However, I ignored both. Noted that LogosError.log of 0728 apparently contains that quit.
Lots of Exceptions and Errors in the logs from 0738 until the crash at 0826, but they are beyond my ability to decipher.