Have you seen this????
I'm using an iMac + leopard+ATI,RadeonHD2600 with 256Mb.
I had this problem in AC11, and With AC12.
Nando Mogollon Director @ BuilDigital nando@buildigital.com.au Using, Archicad Latest AU and INT. Revit Latest (have to keep comparing notes) More and more... IFC.js, IFCOpenShell All things Solibri and BIMCollab
Already discussed in different threads, apparently is an OS X + ATi card problem. Search for shatter. There was hope that 10.5.5 would fix it but apparently it didn't.
Eduardo Rolón AIA NCARB AC27 US/INT -> AC08
Macbook Pro M1 Max 64GB ram, OS X 10.XX latest another Moderator