I did a fresh install on another disk and identical system. Seems to work just fine, so I'm not sure what the issue is/was? Perhaps the disk has a problem.
Update: For those who come across this thread … The cause of one PC not booting properly is still unknown but most likely a hardware issue with the MB.
I determined that the issue was not the disk drive, cables, or network cards. I installed on two systems with identical MB (Asus p4c800e) and bios settings. On one board, the standard ich sata port would not boot properly. Same drives on alternate PC never showed a problem. Switchiing to the Promise controller sata port on the bad board does work. Other OS's have no problem booting (linux, windoze). I can only assume that the older MB may be failing in some way.
I'm new to BSD and not familiar with how BSD determines device names, but on one it would find the disk as ad4s1a and on the other (non-working) ad8s1a with promise controller disabled.