I'd love to know if someone had this problem and find a fix:

Im using ubuntu studio 12.04 (with QjackCtl) and eveytime i start pd-extended (but not puredata) all other audio stops. it looks like pd takes over the whole audio. playing around with jack didnt much help

Does anyone had this thing?
Many thanks in advance,
Danwe

I am having the same problem, It even stops other audio using Jack. Using Alsa Sink does not help either.

edit: vanilla Pure Data does not suffer from this.
I am using Ubuntu 14.04

same problem on ubuntu 14.04-3 amd64/ all other audio stops (alsa, jack)

I find that the following steps usually solve this problem:

1. open a patch
2. close it
3. open it again
4. turn DSP off and on again.

This has worked reliably well for me on a variety of Ubuntu and PD releases.

i tried, but it says always:
ALSA output error (snd_pcm_open): Device or resource busy

pulseaudio causes this problem?