When you say you are not able to acquire more than 1 AI channel with LabVIEW, are you getting any error indication in your VI, any error code or anything?
It would be interesting to know if you receive any error.
Also, what happens if you try to acquire 2 or more channels from the test panels in MAX?
What is the sampling rate you are specifying?
Regards,
AlessioD
National Instruments