I havent been on GT5 for 4 or 5 days,come back on, and the shadowing around the cars have gone from small jaggered edges which i could deal with to huge big blocks which looks horrific and disturbing from a game with attention to detail.
I thought about this when I went home and noticed something.
Some tracks have far worse shadows than others. If you drive Tuskuba you'll notice the shadows are perfectly rendered. They are smooth with no "blocks," and no flickering.
This is not the case on most other tracks. I think this is due to the Dynamic lighting system.