Since 2.64 Blender keeps rendering out black blank bewildering images

Artistic Support Lighting and Rendering
1

Alliteration!
Hello everyone, I have downloaded the latest build of blender today to see if it doesn’t crash when loading an .exr from Maya 2013 (it worked on Mac, not on PC). I also wanted to try out the new smoke sim tools but when I render it out all I get is a black render
Ever since getting 2.64 when I simply hit render on the default scene all I get is a completely blank black render, why is that?

2

Attach or link to your problem blend file so that when you just press the render button it comes out black

3

Here (its simply my default, the only thing I think I changed are key settings and frame-rate) default.blend (472 KB)

4

Look in the Node window set to Compositing Nodes. You have enabled nodes and in the Render / Post Processing panel you have set it to use this Compositing node system for rendering. The node system you are using has no input hence it is black.
Either set up a real node system, turn off the nodes or disable in Post Processing panel

5

That worked, thanks!