/usr/X11R6/bin/X was improperly linked after install to the default XFree86 binary instead of the installed, specified accelerated server (in this case it was XF86_S3) This caused startx to fail because it couldn't run with the XF86Config file(s) written for the S3 server.
This defect is considered MUST-FIX for Winston Beta-5
Fixed in latest beta.