crackling + delayed audio!!

[myfilthyheart]

i have two issues going on right now. the first one, any time im using the virus as my imac sound output, sound is getting delayed. like, im on youtube, with my speakers hooked up to my virus, and the imac output is set to the virus.. and theres a delay of like, 5 seconds on any video i watch. this does not happen when im using the imacs onboard output. id like to use the virus as my primary output, and i cant imagine why this is happening.

the second problem is that every time i use the virus as the output for logic 8, when the track im working on peaks, i get this nasty crackling sound in my speakers. this only happens when the track physically peaks, regardless of the output volume. is this a monitoring feature of the virus, to tell me that my music is peaking? or is there something wrong here?