I didn't have this problem pre 3/3 on the old UA site:

My SIN-NRT-SFO-YYZ flights are showing up in the order SIN-NRT, SFO-YYZ, NRT-SFO now when I look at my reservation (or look at seat assignments), presumably due to the fact that in local time zones, SFO-YYZ (16:02 - 23:58) begins before NRT-SFO (17:25 -10:35), but in GMT they would be in the correct physical order. All the same calendar day of course.
Nice programming there...

On an unrelated note, in the same itinerary, my 2 waitlisted upgrade segments appear at the end of the list of flights (i.e. those segments appear once as economy, and then again as business waitlisted), which is fine and good, except that now the line that says "... you will earn up to XXX award miles" includes the waitlisted segments (i.e. is double-counting those segments and therefore misleadlingly high)!

Same issue here. The segments on the re-cut PNR show up in apparent-time order instead of actual-time order with timezone. So my LAX-IAH segment departing at 11:36 AM departs BEFORE my NRT-LAX segment, leaving "same-day" at 5:10pm, due to the dateline crossing.

I posted this in the Integration bugs thread, but didn't get any reply at all. I'm hoping that this is just a display-sort issue. My fear is that it's a segment-order issue that will create problems when trying to check-in for the NRT-LAX segment out-of-order...

Wow, that's a terrible problem. Have you called?

Not, that it's the quickest method of a resolution given hold times.

Ah, the competence of the CO IT staff continues to amaze me...

Called in and it's just a PNR ordering issue. Would not have affected actual flight coupons when it came to flying them. (so they say).

Agent fixed it on my record and everything shows up ok.

Now... allow me to whine that in the process of fixing this, I somehow got re-deducted for the RPU that I'd applied to this itinerary. So now I have to get my regional back. *sigh* It's like whack-a-mole with these issues this week.