[dickswan]

The order in which controllers are daisy chained determines their I2C address. Addresses are somehow automatically configured by the hardware with the controllers closer to the NXT having the lower addresses.

So, if you're using daisy chaining, make sure the physical daisy chaining order corresponds to the parameters that are specified in the labVIEW (or NXT-G) blocks/VIs.

Also try non-daisy chaining and using two sensor ports: one for each of the two Controllers. You'll have to make minor changes to the program for the "port" and "controller number" inputs. Once you get this working properly, thn you can try to convert to daisy chained arrangement.