I have tried to play the preset "Miller" at higher velocities and you are right: it plays only below 95; I guess that the sound is assigned to a velocity switch and, now that they changed the sounds stored in the flash memory, the sound assigned to the higher velocities is gone. I think it's a bug and they will fix it in a future OS update.
Other sounds are changed as well; for example "Golden trumpet" had a velocity switch too; now it plays the same sound from 1 to 127; the velocity switch, on the other hand, has been assigned to "Trumpet". Frankly, I liked the old "Golden trumpet" more (it was one of my favorite SD1 sounds).
Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.