Leopard - QMaster and Virtual Cluster problem

Hi guys,
Up until yesterday I had my MacPro Octo running under 10.4 where I did succesfully set up a Virtual Cluster using 4 instances for Compressor. It worked as a charm and my MacPro was doing it's job perfectly.
Today, I made a bootable backup of my 10.4 install and installed 10.5 using the erase and install options ( clean install ). I installed all my software again and tryed setting up my Virtual Cluster again, using the same settings I had under 10.4. Sadly I can't seem to get it working.
In the QMaster Preferences pane, I have the QuickCluster with Services option checked. For the compressor entry in the Services I have the Share Option checked and used 4 isntances for the selected service. The Quickcluster received a descent name and the option to include unmanaged services from other computers is checked.
I have the default options set in the Advanced tab, ( nothing checked except log service activity to log file and Show QMaster service status in the Menu Bar). I then started the Cluster using the Start Sharing button.
Now I open u Compressor and add a file to process ( QT encode to iPod ), but when I hit the Submit button, my Virtual Cluster doesn't show up in the Cluster Dropdown. If I now leave the Compressor GUI open for 5 minutes, it will eventually show up in the list, and I can pick it. Sadly, picking it from the list at this point and hitting the Submit button makes Compressor Hang.
I checked my logs, but the only thing concerning Compressor I could find is this :
4/12/07 20:12:35 Compressor[242] Could not find image named 'MPEG1-Output'.
4/12/07 20:12:35 Compressor[242] Could not find image named 'MPEG1-Output'.
4/12/07 20:12:35 Compressor[242] Could not find image named 'MPEG1-Output'.
4/12/07 20:12:41 Batch Monitor[190] * CDOClient::connect2: CException [NSException raised by 'NSPortTimeoutException', reason = '[NSPortCoder sendBeforeTime:sendReplyPort:] timed out (218488391.647220 218488361.647369) 1'], server [tcp://10.0.1.199:49167]
4/12/07 20:12:41 Batch Monitor[190] exception caught in -[ClusterStatus getNewStatusFromController:withOptions:withQueryList:]: NSException raised by 'NSPortTimeoutException', reason = '[NSPortCoder sendBeforeTime:sendReplyPort:] timed out (218488391.647220 218488361.647369) 1'
4/12/07 20:17:55 Batch Monitor[190] * CDOClient::connect2: CException [NSException raised by 'NSPortTimeoutException', reason = '[NSPortCoder sendBeforeTime:sendReplyPort:] timed out (218488705.075513 218488675.075652) 1'], server [tcp://10.0.1.199:49167]
I tried Stopping and then Restart Sharing and I noticed the follwoing entries in my log :
4/12/07 20:23:26 compressord[210] can't refresh cache from file "/Library/Application Support/Apple Qmaster/qmasterservices.plist"
4/12/07 20:23:26 compressord[211] can't refresh cache from file "/Library/Application Support/Apple Qmaster/qmasterservices.plist"
4/12/07 20:23:26 compressord[213] can't refresh cache from file "/Library/Application Support/Apple Qmaster/qmasterservices.plist"
4/12/07 20:23:26 qmasterca[269] can't refresh cache from file "/Library/Application Support/Apple Qmaster/qmasterservices.plist"
4/12/07 20:23:26 qmasterqd[199] can't refresh cache from file "/Library/Application Support/Apple Qmaster/qmasterservices.plist"
4/12/07 20:23:27 QmasterStatusMenu[178] * CDOClient::connect2: CException [NSException raised by 'NSPortTimeoutException', reason = '[NSPortCoder sendBeforeTime:sendReplyPort:] timed out (218489009.603992 218489007.604126) 1'], server [tcp://10.0.1.199:49407]
4/12/07 20:23:27 Batch Monitor[190] * CDOClient::connect2: CException [NSException raised by 'NSPortTimeoutException', reason = '[NSPortCoder sendBeforeTime:sendReplyPort:] timed out (218489037.738080 218489007.738169) 1'], server [tcp://10.0.1.199:49407]
4/12/07 20:23:27 Batch Monitor[190] exception caught in -[ClusterStatus getNewStatusFromController:withOptions:withQueryList:]: NSException raised by 'NSPortTimeoutException', reason = '[NSPortCoder sendBeforeTime:sendReplyPort:] timed out (218489037.738080 218489007.738169) 1'
Batch Monitor immediately detects the cluster being active again, but Compressor doesnt, leaving me only This Computer available in the Cluster drop down when submitting a batch.
In my Activity Monitor, I notice that CompressorTranscoder is not responing ( the 4 CompressorTranscoderX processes are fine ) and the ContentAgent proces isn't responding neither.
Does anyone have any clue on what I could check next or how I could fix my problems ?
Thanks a lot in advance,
Stefaan

Bah, this is crazy, today it doesn't work anymore. Yesterday my cluster was showing up in the Dropdown window, and I could submit a batch to it, and it got processed over my virtual cluster.
Today, after finishing the second part of my movie, I tried it again. I didn't change anything to my settings, my machine hasn't even rebooted (just recovered from sleep mode) and my cluster isn't showing up at all anymore. Even the Qmaster menu doesn't show it
Guess, I'll have to wait out until it appears again, or try a few things out

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