I had something like 4 civilian ships delivered during my last build cycle, and it appears to have crashed the whole civilian shipping system. The freight fleets no longer show their names on the system map, although the icon is still there, and the shipping lines screen shows them just sitting there doing nothing.
All 4 ships were cargo ships, and I previously had one cargo and one colony ship in operation, and they were working fine. Also, this is one of my big games, so there might be an issue with total ship numbers.
I did a bit more poking, and they're not responding to contracts, and when I went into designer mode, they didn't take orders there, either.
Edit:
For a while, it looked like they weren't responding, but they're back, and trade has resumed as normal. They fulfilled the contracts, and are now carrying trade goods. The names on the icons are still not showing up, although it's possible that there's a switch somewhere I accidentally turned off. This might be a false alarm.