It seems someone else was just having the same problem.
http://archicad-talk.graphisoft.com/viewtopic.php?t=53250
Are you using version 19 as well?
Check you have the latest update installed.
Barry.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11