When doing a clean install of 4.6 on a machine with a 20 Gb Windows partition at the beginning of a 60 Gb disk, I needed to create the OpenBSD (A6) partition. I did so in CHS mode. When it prompted me for the starting sector of the partition, it offered [1] as the default. When I hit 'enter', it complained that 0 was not a valid starting sector. Typing '1' and then 'enter' worked around it. I will submit a bug report later, if someone else hasn't beaten me to it.
/Don
