On Sun, 13 May 2012, Loris wrote: I've been experiencing problems as well when exporting under UbuntuStudio 12.04 (kernel 3.2.0-23 & jack2). In my case, the export works fine, but at the end, when ardour tells jack to return to realtime mode, I see an error AcquireRealTimeError, and then Ardour freezes up, and will not play. Qjackctl still indicates that jackd is running, but `ps aux | grep jack` shows jackdbus, but no jackd. I have to force-kill jackdbus, qjackctl, and ardour and then start over. I wonder if it's related to pulseaudio (our recent favorite whipping-boy). UbuntuStudio 12.04's implementation of qjackctl automagically makes connections to clients called 'pulseaudio jack source' and 'pulseaudio jack sink' whenever you use it to start jackd. Then when you go to stop jack, it throws up a warning about clients still connected. I have to go to the 'connections' window, and do a 'disconnect all' before stopping jack. If I simply do a 'stop anyway' in the warning window, I'm left in a state where jack won't start again until after a reboot. -- Rick Green "Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." -Benjamin Franklin "As for our common defense, we reject as false the choice between our safety and our ideals." -President Barack Obama 20 Jan 2009