I don't know what happened to beta 3, but beta 4 has just been released.
I'm getting about a 2-4 fps boost over beta 2, and it looks like the
aberrant texture problem as been fixed.
ftp://ftp.rendition.com/pub/rrq106b4.zip
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Emory University Graduate School of Arts & Sciences
Nascar Setups Page: http://www.racesimcentral.net/~ebusch/