Blender only outputs when rendering animation

Support Lighting and Rendering
1

I was doing an animation with simple extruded text, a path that had a camera and light source following an invisible block (for back and forth movement along the text). From one moment to the next, it stopped outputting single frames and only creates data in the output directory when rendering an animation. I’ve tried using a different output directory, different output settings and even loading the start-up file.
Any idea what could be causing this?

I’m using Blender version 2.68

2

The output location is only for animations only (read the tooltip).
Rendered images are not saved unless:

Use the Image / Save as Image menu entry of the render output window.
or
After the render has finished press F3 to save it
or
Use the compositor with a file output node
or
Use the Auto Save addon http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Render/Auto_Save