Did you see this in the PD FAQ?: http://puredata.info/docs/faq/how-can-i-run-pd-with-realtime-priority-in-gnu-linux

On Dec 30, 2013, at 3:31 PM, pd-list-request@iem.at wrote:

From: Alexandros Drymonitis <adrcki@gmail.com>
Subject: Re: [PD] Mess with Pd installation on Linux
Date: December 30, 2013 at 3:30:47 PM GMT+1
To: yvan volochine <yvan.pd@gmail.com>
Cc: pd-list <pd-list@iem.at>





On Mon, Dec 30, 2013 at 4:12 PM, yvan volochine <yvan.pd@gmail.com> wrote:
On 30/12/13 14:29, Alexandros Drymonitis wrote:
I've realized that I need to open pd with sudo in order to have it work
with jack (I also have to open jack with sudo in order to use the
firewire).

as IOhannes said, you _should not_ do that..
(if you do it could mean that you did not add yourself to the `audio` group, as suggested by my previous link)
Ok, I was opening jack with sudo before you posted the link, now I can indeed open it without sudo and it will see the firewire, no prob. So I'm also opening pd without sudo, but I get the same behaviour. Sometimes it works, sometimes it doesn't. 

how do you start jack? can you post here the full command?
jack -d firewire (I use & if I want to open pd from the same terminal window, but don't really know how to turn off jack afterwards..)
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--------
Dan Wilcox
@danomatika