well...this is a gsm port...they don't have prl updates, that is why the option is not in the menu.
it is interesting that 3 phones did not reboot. mine did just like it always had, but took a bit longer (10 minutes or so)
I still think it is communication related ...between the tower and the phone
the phone is wiping all of those settings, and then downloading them from teh tower when we do this... so in your case, along with the other three guys...the phone never made that download.
I have done this on both the z port and the mytouch port with no issues..but the z is 2.0 like you said. It could be that...but why does it not affect everyone?