My first Virus!! !Audio only 16 BIT /44 K????

[ZEBASTIAN]

hello....i just bought my first Virus ever....well, i had the Poco Virus....nice , but the TI rocks!!! ....Ive found a few problems with the audio.
Im on mac osx tiger 10.4.3. I went to the AUDIO/MIDI set aplication and set up Virus TI to be my output/input.....now i just wan to change the bit resolution from 16 Bit to 24....but it is NOT an option...it only shows 16 bit and 44/48 khz.
isnt supposed to be able to get to 24/196?
second problem.....SPDIF does NOT WORK....I conected the Spdif out from Virus to a Presonus Central Station and the Central Station doesnt get the virus signal...Imnot newbie when it comes to these matters....I was using the Spdif of the central station with another soundcard without issues..its not rocket science....
whats going on???? anyone experiencing the same issue with SPdif out and bit resolution???

my set up: Apple G5 Dual 2.0, Tiger 10.4.3 . Logic Pro 7. Virus TI 61.