Can't rotate the Camera straight up or down

I notice that as I rotate the camera to look straight up or down, the scene goes to a singularity and disappears. Ideas?

Im pretty sure you cant look directly down the Z axis - no idea why though.

I was just about posting this issue, the problem looks to be with small angles from Z.
In this case, the distance is wrong

use sio2LookAt if you want to look straight down the Z axis... more calculations are required compare to the regular sio2CameraRender but that will get the job done