I'm documenting this now in case it's not reproducible, but I'll come back and post more if I'm able to get a reproducible case. I had had Logos running overnight and hadn't done anything in it for hours. Then I opened the NET Bible (by typing "NET Bible" into the command line). Then I clicked the Tools menu to drop it down, and Logos crashed before displaying the menu.
Error ID: 9247
Error detail: NullReferenceException: Object reference not set to an instance of an object.
Log files: 1374.ToolsCrash.zip
UPDATE: Can't reproduce it now. But I do recall the layout before I opened the NET Bible was a single tile that filled up the entire Logos workspace and had several tabs open. I'm now wishing that the auto-generated layout snapshots would be autosaved (synced) and recovered after a crash!