I am having a host of problems on my mac running Zbrush 4 with the ATI Radeon HD 4870. I tried re-installing the program but the issues keep coming. Just a few issues have been.
Alpha Roll won’t work properly
Resym won’t work
Losing symmetry even when I haven’t turned it off while sculpting
Remesh comes up mutilated with holes in i
Does anyone else have this card and have similar issues.
I’m running OS 10.6.6
2.93 Ghz Quad Core Intel Xeon with 6 gigs of 1066 MHz DDR3 Ram
Add backface masking and color spray to the mix… not sure why I’m having so many issues. Guess I’m going to have to try another fresh install. Don’t know what else to do. I can take my tower into Apple since it’s covered under the warranty, but I’d like to see if anyone else has issues with this card first.
hi,
I have this card, and have experienced issues of a different nature.
None of the ones you list here - but I am actually running Windows 7 via Bootcamp on my Mac with the ATI Radeon 4870.
My main issue is that ZBrush will save a file as normal, behave completely as expected - then later on when I try to re-load the file, or “Tool” rather… it crashes ZBrush instantly - therefore losing my work. 
I did have issues with this card on Windows a while back, but then I downloaded the “Catalyst” drivers from ATI - which radically improved the performance of this card, and eliminated all issues. As far as updating the drivers for this card on Mac OS X, it’s essentially built into the core OS… so, not ATI drivers for Mac AFAIK.
good luck!
-Ben