>
> OK, it's not a RTT problem then. I don't have more idea, sorry
I've tried for a couple of months to understand the cause. We reach the
same point: no more ideas!

> Was the last one (with negative values) done on wmware too ?
> Maybe wmware could explain the negative values ...
>

Yes it was made on a WM: maybe the cause of nagative value;

Many thanks for the interest,
Roberto