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ATi x1900 / Mac Pro / ACv11 3D Window Flickering!!!

genarch
Enthusiast
I have a Mac Pro running OS 10.5.7 with an ATI Radeon x1900 graphics card. In ArchiCAD (v11 and 12) I get a LOT of flicker when navigating the 3D window with OpenGL enabled. The flicker seems related to the z-buffer, since I see through walls when the flicker occurs. Anyone else have this problem or know how to fix? Thanks.
Mac OSX 11.6.8

AC26, Artlantis 2020, TwinMotion

iMac Pro 2017 / 8-core 3.2 GHz / 32GB RAM
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