Sorry for the trouble lately. It appears that my rebuild 6.4.1-2 worked for me but not for others, while 6.4.1-1 did work for most others.
It's a libpng problem. I updated libpng in my UnixImageIO framework, but forgot to include the update in the GDAL Complete package. For anyone who updated UnixImageIO separately, GRASS 6.4.1-2 works.
I've updated the GDAL Complete package. But for a quick update, just install the latest UnixImageIO.
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William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
http://www.kyngchaos.com/
"This is a question about the past, is it? ... How can I tell that the past isn't a fiction designed to account for the discrepancy between my immediate physical sensations and my state of mind?"
- The Ruler of the Universe