For those following along, the first line that says
0000000: 5168: General: Starting logging: Date: 11/10/2014 5:28 pm
contains the main thread ID. In this case, it is 5168.
I then went to the end of the log file and inserted the cursor. I pressed Ctrl+F for Find and entered " 5168". Notice the space before the ID. This made sure I was just just searching for the ID and not 5168 embedded in another number such as 15168976 (real example from the log). I am using Notepad to open the text file so I also selected "Up" as the direction to search.
By using this method, you get to the last instance of the main thread which is:
14704498: 5168: Import: CSynchronizeDatabase::ImportAutoImport: Stopping current auto-import processing
This is what Matt referenced in the previous post.
I've had JRiver hang for me when an external hard drive spins down and then JRiver tries to access the drive. Perhaps that is what is happening here. My friend has two or three Synology NAS enclosures plus a local disc for media storage.