Thank you for hanging in with me on this... This is deeper than I've had to dive into the system so your patience is appreciated.
The Jobcontroller log is fairly lenghty as you might expect. Here are the top (I assume most recent) entries in that log:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<logs tms="414000577.416" tmt="02/13/2014 10:09:37.416" pnm="CompressorJobController">
<mrk tms="414000577.417" tmt="02/13/2014 10:09:37.417" pid="13430" kind="begin" what="log-session"/>
<mrk tms="414081180.138" tmt="02/14/2014 08:33:00.138" pid="15215" kind="begin" what="log-session"/>
<mrk tms="414711430.860" tmt="02/21/2014 15:37:10.860" pid="20934" kind="begin" what="log-session"/>
<mrk tms="415130037.704" tmt="02/26/2014 11:53:57.704" pid="25004" kind="begin" what="log-session"/>
<mrk tms="415239359.716" tmt="02/27/2014 18:15:59.716" pid="26831" kind="begin" what="log-session"/>
<log tms="415244330.342" tmt="02/27/2014 19:38:50.342" pid="26831" msg="Service DYJ5T3D6-7JY0-85E3-R2D2-289658855E9G sessionID mismatch (C5728F7B-542D-4ABA-AAF2-D166C4D92C10 != 2173323B-4AA7-4666-94B7-6CE3AC77F2E6) - did the service go down?"/>
<log tms="415244330.345" tmt="02/27/2014 19:38:50.345" pid="26831" msg="CJobControllerServer::tickleService: we haven't heard from service DYJ5T3D6-7JY0-85E3-R2D2-289658855E9G for 8 sec. and connecting failed - the service is down. %3Cad id=%22DYJ5T3D6-7JY0-85E3-R2D2-289658855E9G%22 unmg=%220%22 suid=%22-1%22 session=%222173323B-4AA7-4666-94B7-6CE3AC77F2E6%22 url=%22tcp://127.0.0.1:53920%22 hostModel=%22MacBookPro5,1%22 hostPerfScore=%227.59%22 host=%22Rod'sMBP.local%22 ver=%222.2%22 kind=%22servicecontroller:com.apple.stomp.transcoder%22 name=%22Rod'sMBP.local%22 desc=%22Compressor%22 status=%225%22 hostID=%221A602E45-E4A2-5A01-8A01-8FD5D85CFE31%22 scope=%221%22%3E%3C/ad%3E"/>
<log tms="415244330.412" tmt="02/27/2014 19:38:50.412" pid="26831" msg="Not releasing service DYJ5T3D6-7JY0-85E3-R2D2-289658855E9G, sessionID has changed (C5728F7B-542D-4ABA-AAF2-D166C4D92C10 != 2173323B-4AA7-4666-94B7-6CE3AC77F2E6)"/>
<log tms="415244330.412" tmt="02/27/2014 19:38:50.412" pid="26831" lvl="2" msg="Handling exception: batch = Richard Ellis R1, Marcus Raven R1, John Sanders R1 and 3 more, job = Richard Ellis R1, target = Richard Ellis R1-x.264 TCB Movie.mov, segment = Richard Ellis R1-x.264 TCB Movie.mov, host = Rod'sMBP.local, exception = service down, fail count = 1. There are 0 hosts which haven't failed this request yet."/>
<log tms="415244330.414" tmt="02/27/2014 19:38:50.414" pid="26831" msg="Rescheduling the failed request."/>
<log tms="415247786.935" tmt="02/27/2014 20:36:26.935" pid="26831" msg="Service DYJ5T3D6-7JY0-85E3-R2D2-289658855E9G sessionID mismatch (2173323B-4AA7-4666-94B7-6CE3AC77F2E6 != 3405C0CA-FFA8-48C1-A564-B00288198BFD) - did the service go down?"/>