Sudden Strange Behaviour from Serviio

After several months of quite happily running Serviio I'm now experiencing some weird problems that I'm at a loss to explain. After a bit of experimentation I can recreate the symptoms as follows
1 Switch on Tv, boot laptop, launch Serviio app and console. Device appears in console with green light
2 Go into internet video on TV, browse folders, find film (which I've previously played OK with no problems). Film plays, but is very noisy
3 Go back into folders, try to select another film and get the message 'Cannot connect to the server please check server settings'
4 In Serviio console light is still green, server is running, and I can see the app running in Activity Monitor
I've also found that when I shut down, it times out and gives me message that Serviio has cancelled shutdown and I have to force quit the Serviio app to shut down - I have never had to do this before.
I've tried various hard and soft reboots of my router - though other internet content is running fine so I'm pretty sure it's not related to my connection - and deleted and reinstalled Serviio (saving my previous library).
I've found the following errors and warnings in the log at various points :
2012-01-21 13:28:27,338 WARN [DiscoveryAdvertisementNotifier] Could not advertise the device on any available NIC, will try again
2012-01-21 13:32:24,785 WARN [ProcessExecutor] Process /Applications/Serviio.app/Contents/Resources/Java/../../MacOS/ffmpeg has a return code of 1! This is a possible error.
2012-01-21 13:32:24,785 WARN [ProcessExecutor] Process /Applications/Serviio.app/Contents/Resources/Java/../../MacOS/ffmpeg has a return code of 137! This is a possible error.
Running Max OS x 10.6.8, 2.33 Ghz Intel Core 2 Duo, 2 GB Ram, Serviio 0.6.1 and Sony Bravia TV
The only version of ffmeg I have is the one that came with the latest build of Serviio.
any ideas ?
Cheers
1 Switch on Tv, boot laptop, launch Serviio app and console. Device appears in console with green light
2 Go into internet video on TV, browse folders, find film (which I've previously played OK with no problems). Film plays, but is very noisy
3 Go back into folders, try to select another film and get the message 'Cannot connect to the server please check server settings'
4 In Serviio console light is still green, server is running, and I can see the app running in Activity Monitor
I've also found that when I shut down, it times out and gives me message that Serviio has cancelled shutdown and I have to force quit the Serviio app to shut down - I have never had to do this before.
I've tried various hard and soft reboots of my router - though other internet content is running fine so I'm pretty sure it's not related to my connection - and deleted and reinstalled Serviio (saving my previous library).
I've found the following errors and warnings in the log at various points :
2012-01-21 13:28:27,338 WARN [DiscoveryAdvertisementNotifier] Could not advertise the device on any available NIC, will try again
2012-01-21 13:32:24,785 WARN [ProcessExecutor] Process /Applications/Serviio.app/Contents/Resources/Java/../../MacOS/ffmpeg has a return code of 1! This is a possible error.
2012-01-21 13:32:24,785 WARN [ProcessExecutor] Process /Applications/Serviio.app/Contents/Resources/Java/../../MacOS/ffmpeg has a return code of 137! This is a possible error.
Running Max OS x 10.6.8, 2.33 Ghz Intel Core 2 Duo, 2 GB Ram, Serviio 0.6.1 and Sony Bravia TV
The only version of ffmeg I have is the one that came with the latest build of Serviio.
any ideas ?
Cheers