I have not been able to reproduce the behaviour that you are seeing. I took the graphs project from \samples\usrint\ changed the left axis on the plot to autoscale and 10 division, and changed the data point generation code to read:
/** Generate some random data first **/
for (i=0; i<100; i++)
datapoints[i] = 12.4;
Run it, plot it, and it's right on.
Do you have any more specifics or reproducing this? Did following these steps clarify anything?
Regards,
Amaury R.
-NI Applications Engineering