Bc2000 (for the BCF2000 & BCR2000)

Hello. When I use my bcf2000 in mackie mode on Cubase sx 3.1  there's lot of delay/latency . If I move a fader , it returns to positions and after some tweaking of knobs and mainly press function keys  the bcf almost do not respond anymore . When I use in BC mode instead everything goes fine , faders follows automation in real time .I noticed that another generic remote Preset from behringer (simple mixer )used in bc mode caused about the same  delay  I'm using Vista , firmware 1.10, Core duo , 1 Gb memory.  Any check-list suggested to solve this problem ? It seems to be any config issue . Thank you. Denis