I guess a lot of folks are not seeing this on their "My Account Page:":
Please note: it may take up to 72 hours for your combined award balance to display. Be assured that all award miles, Premier qualifying miles, Premier qualifying segments and upgrades in your MileagePlus account are safe as we finalize our system migration. Also, changes to your account profile are not available until the transition period is complete.
A lot of the venting so far seems to fall into the 72 hours wait time before all the dusts settles.....