But what I mean is, when you're having this problem, do you get *different* results if you set your sensivitity in XIM4 to, let's say, 1 or 50? Do 1 and 50 feel exactly the same? If they feel exactly the same, try 1 and 500.
I know you said you did things like this the first time, but I want you to try these settings, specifically, and in this order, when it happens again:
1, 5, 25, 100, 250, 500
For each number, set both ADS and Hip to the same value. Then try using the mouse. See how it feels. Then try the next number in the list. If they all feel the same, that's what I want to know.