Robert,
I use @YM for my charts and time of sales. I use the current symbol which is YMH07 for the matrix. Usually what happens is the price on the matrix and the charts will not match if the matrix shows the old contract. You can tell right away if you are looking at the old contract or the new one.
Regarding those dates.... maybe you are right? hehe.. i never pay attention to them myself. I always have people reminding me its rollover day
