Check DAS module has loaded. E.g:
cavsi1:~> lsmod | grep ds ds 10356 4
If not try:
su /etc/init.d/ds
Try a second time
Bandpass on channels from that DAS will look crap. DAS GUI will still work.
Try a reset on the module.
Try a power cycle.
Try to force the data set to load. Chris knows how to do it.