I've just got a Focusrite Saffire LE (firewire audio device, that is), on the strength of FreeBoB and FFADO support for it. However, even though it's recognised by the system I can't get jackd to play nicely.

Using qjackctl, I get an error stating "cannot complete execution of the processing graph (Resource temporarily unavailable)", followed by jack crashing. Naturally there's no sound or anything...

I'm not sure how to debug and fix this problem - can anyone help?