[Mark McLeod]

Try all those suggestions by Palardy.

Assuming all the latest updates have been applied. The second most common reason for this has been the state the camera was left in after last year's experiments.

The safest thing to do is to reset the camera altogether, then use the "Setup Axis Camera" tool.
Reset by pulling the power, then holding the reset button while plugging the power back in and continuing to hold until you get the orange light around the lens.