The situation was that the capture was working fine ( one flashing led , 3 solid ).
I was updating raspbian , and going through a few reboots.
Next time I tried capture ( raspivid or raspistill ) I got an error about MMAL ENOMEM
A shutdown , remove power and re-power cleared the problem , and everything worked as normal.
andycReply To: RasPi Reboot causes PiCapture to stop working until power cycle..