This is what I see on my system:

These are my normal settings. Do I have the setting you're referring to? Pixel samples? Although I do have that already cranked up a bit, so I'm guessing that isn't it. Sigh. I do hope this isn't somehow because my video card doesn't support something.

Another questiion: When I set the subdivisions to 2, the edges and corners of the cubes become rounded. Is there someway to keep them crisp?