Yes, I have looked at all of session.log. I am cutting and pasting it here, in case I missed something:
$ cat session.log
NXAGENT - Version 3.5.99.0
Copyright (C) 2001, 2011 NoMachine. See http://www.nomachine.com/ for more information.
Info: Agent running with pid '14374'. Session: Starting session at 'Thu Jun 4 19:23:08 2015'. Info: Proxy running in server mode with pid '14374'. Info: Waiting for connection from 'localhost' on port '30022'. Info: Accepted connection from '127.0.0.1'. Info: Connection with remote proxy completed. Info: Using LAN link parameters 1536/24/1/0. Info: Using agent parameters 5000/0/50/0/0. Info: Using pack method '16m-jpeg-9' with session 'unix-kde-depth_24'. Info: Not using NX delta compression. Info: Not using ZLIB data compression. Info: Not using ZLIB stream compression. Info: Not using a persistent cache. Info: Listening to X11 connections on display ':57'. Info: Established X client connection. Info: Using shared memory parameters 1/1/0/0K. Info: Using alpha channel in render extension. Info: Not using local device configuration changes. keyboard file created Error: Aborting session with 'Could not open default font 'fixed''. Session: Aborting session at 'Thu Jun 4 19:23:11 2015'. Session: Session aborted at 'Thu Jun 4 19:23:11 2015'. Warning: Signals were not blocked in process with pid '14374'. Info: Waiting the cleanup timeout to complete.
-devsk