The Google SketchUp team has been working a lot... Some of the issues that have been fixed:
"Shadows:
- The shadow bug has been fixed! Previously, when the eye was in shadow, artifacts that look like inverted shadows could show up over all or part of the screen and annoying flickering could show up during animations.
- The “shadow strings” bug. Previously, shadows could show string-like artifacts. There is now a Shadow Strings Fix toolbar which allows you to toggle on and off a fix for this issue.
Here a video showing this important fix:
