Thanks for your prompt reply.
I have tried what you said - the only difference appears to be the Video bitrate setting.
Unfortunately, this has made no difference - I still get poor video quality and no sound.
Do you have any more ideas or, Is it possible to restore v3.6.5 to the 'Previous versions' link on your site:http://www.cocoonsoftware.com/index.php ... &Itemid=56
When I try, I get to download install.zip but it is actually version 220.127.116.11.
v3.6.5 worked well for me so don't understand why 18.104.22.168 doesn't.
Thanks very much