Super strange one here. I'm testing out some segments with Customer Journeys. I can add a contact to a segment, add that to a journey, send an email...everything goes well.
However, when trying it with another contact, this particular contact will not add to a static segment. Below is the view after adding a contact. It obviously looks blank.

After trying a few times, I figured that maybe it's a visual bug. I saved it, backed out, and it does indeed look like there is a user in the segment:

But when adding this segment to a Customer Journey, it seems to get stuck on "processing." I have been able to send an email via a different Customer Journey with a different segment while waiting for this one to process, so it doesn't seem to be a matter of waiting for the marketing-insights service. Any thoughts or troubleshooting here?

Thanks!
EDIT: Took about 45 minutes, but it finally failed:

Morning after update: When I got up this morning it still wasn't working. I dove into some unfruitful research, and discovered it wasn't just one account, but seemed to be all of those created this week. Not good.
I was looking to see if I could identify any difference between the accounts created last week and this (there doesn't seem to be), but then segmenting seems to have suddenly started working again—now about an hour in to the day. Hopefully someone knows what is going on here, because we can't just have contacts not be added to segments randomly...really not good.
Thanks all!