You say you have re-installed Archicad - I assume you have also installed the latest updates (hotfixes) as well?
I would also check you have the latest video card drivers installed too.
Does the same happen when you do a "New and Reset All' or open the blank template?
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