Object not visible

Maybe something stupid but i have an object which i can see in the 3d viewport but as i make a render its not showing up. It has no alpha settings. Any other object added is visible. Also appending it to another blend file isnt the solution.

Here’s the file:
http://www.heijdenskarwei.nl/blender/strange.zip

It makes me pull my hair out (glad that 2.4 has a new particle system :smiley: ) Any help?

Thanx a lot, Twan

You have dupliverts on but the object is not parent of anything.

Thanx a lot CD38,
I must have accidently pushed the dupliverts button. That did the trick!
Twan :smiley: