As I recall, this is what should happen. The spray tool allows you to quickly render any part of the wireframe. Handy if you want a quick reference to what a particular part of your render will look like when you're finished working on it.

Hope this helps.

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...