Does this help at all?
https://archicad-talk.graphisoft.com/viewtopic.php?f=13&t=70813&p=316781&hilit=region#p316696
Is it possible to roll back the update if you have only just done it?
Do you get the bug reporter come up?
If so send it off, take note of the bug number and then contact your local Graphisoft support people and ask them to investigate.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11