Particles don't render I am having problems with my particle system. It just doesn't appear to render but works in the 3D view. I will try to provide as much detail as I can.
The object that is being duplicated for the particle system does not have it's renderable turned off, neither do any of it's parents. I'm using 2.73. Here is the particle system's settings:

Emission:
Number: 200
Start: 0
End: 360
Lifetime: 15
Random: .3
Emit from: faces
Random: true
Even distribution: false
Enumeration parameter that doesn't have a name: random
Use modifier stack  

Cache:
all the default settings  

Velocity:
Normal: 1
Tangent: 0
Rot: 0
Emitter object: 0, 0, 0
Object: 0
Random: 0  

Rotation:
false  

Physics:
Newtonain
Size: 1
Random size: .05
Mass: 1
Multiply mass by particle size: false
Brownian: 0
Integration: Midpoint
Drag: 0
Timestep: .04
Damp: 0
Subframes: 0
Size deflect: false
Die on hit: false  

Render:
Emitter: true
Unborn: false
Parents: true
Died: false
Object
Duplicate object: anobject
Global: true
Rotation: true
Scale: true
Size: 1
Random Size: .05  

Display:
Rendered
Display: 100%
Size: true
Velocity: true
number: true
Color: material  

Children:
none  

Field weights:
all on default  

Force field settings:
all on default  

Vertex groups:
all on default

Screenshot:
Look in the outliner window to make sure the camera icon switch for the particle object is enabled and bright.  This means render the object.

It is quite possible to see the particles in view mode and no particles in render for exactly this reason.  You may place your object particle in a different layer to keep it handy and out of camera view except in its role as a particle.

Look in modifiers panel to see if modifier is enabled in render mode.
The area has the eye , then arrow, then camera for each object.

In Render Layers panel, section Layer, verify the scene and layers include your desired results.



Verify your [global] coordinate selection for the particle system object particle suit your intended purpose and the location is not modified by render only modifiers.  Are your particles moved off viewport?

(I used casual explanation and names as per the user interface)

As always I may say something you may already know or have tested.