Topic: Fireface 800 new mac pro 2,8 ghz (SL) does not work!

Dear reader,

I got problems whith my new mack pro desktop and my fireface 800. When I start my mac the fireface is connected and
everything looks fine. But as soon as I start to play music by clickingon  itunes, internet (beatport), logic my soundcard automatically disconnects. Turning the fireface on/off does not help either form the moment the red host-led starts to burn.
I already installed the latest drivers and updated the fireface hardware reinstalled the drivers, changed cables, changed firewireport, nothing helps.

On my windows PC I havent got any problems so far but with my mac nothing but trouble.

My System spec:

Mac pro desktop
2.8 quad core
6 gb ram
1,65 terabyte hd
ati radeon hd 5770
mac os 10.6.4
logic pro 9

fireface 800 serial no. 23064592
driver latest
firmware latest