Sounds to me like a video card/driver issue.
Are your drivers up to date?
Am am no tech expert and I am not familiar with your Radeon card or if it is even suitable for Archicad.
You have that and an built-in card?
Archicad does not like those integrated cards all that much.
I am not familiar with Macs at all, but can you tell it somewhere in the settings to use the Radeon card only with Archicad?
If it is then maybe that card or its driver is not compatible.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10