freebob / jack won't start since upgrading to 2.1~pre2

Hi, totally new here, I've installed 2.0 last week and started to use it with jack and freebob (for my firewire M-Audio). It worked great but I missed my VSTs so I've upgraded to 2.1~pre2 as I wanted to try the VST/VSti How-to. Now Freebob can't start anymore unless I reboot with the previous kernel, I've tried to re-install it with Synaptics but no luck. I have the following messages when I click on start in JackControl : 23:03:32.274 Patchbay deactivated. 23:03:32.354 Statistics reset. JACK tmpdir identified as [/dev/shm] 23:03:32.517 MIDI connection graph change. 23:03:32.630 MIDI connection change. 23:03:37.394 Startup script... 23:03:37.395 artsshell -q terminate JACK tmpdir identified as [/dev/shm] can't create mcop directory Creating link /home/facochere/.kde/socket-64studio. 23:03:38.132 Startup script terminated with exit status=256. 23:03:38.132 JACK is starting... 23:03:38.132 /usr/bin/jackd -R -dfreebob -r44100 -p128 -n3 -D 23:03:38.135 JACK was started with PID=4535 (0x11b7). jackd 0.103.0 Copyright 2001-2005 Paul Davis and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details JACK compiled with System V SHM support. loading driver .. Freebob using Firewire port 0, node -1 Ieee1394Service::initialize: Could not get 1394 handle: No such file or directory Is ieee1394 and raw1394 driver loaded? Fatal (devicemanager.cpp)[68] initialize: Could not initialize Ieee1349Service object Fatal (freebob.cpp)[69] freebob_new_handle: Could not initialize device manager FreeBoB ERR: FREEBOB: Error creating virtual device cannot load driver module freebob 23:03:38.355 JACK was stopped successfully. 23:03:38.355 Post-shutdown script... 23:03:38.355 killall jackd jackd: aucun processus tué 23:03:38.578 Post-shutdown script terminated with exit status=256. 23:03:40.154 Could not connect to JACK server as client. Please check the messages window for more info. JACK tmpdir identified as [/dev/shm] Thanks in advance