Harmy said:

Are you sure your TV's brightness and contrast are calibrated properly? I have to turn my TV's brightness way up to see the line. This would also cause the grain in the logos to be more intrusive.

The flickering is there and I'm well aware of it and I don't know how or why it happened but it's only in a few shots (I can't recall any beyond those you mentioned) and would probably again be exaggerated by improperly set contrast.

I'll check my contrast and brightness later, but I don't think they're pumped up. My TV is known to suffer from rising black levels, so I wonder if that's an issue.