How to reproduce the bug:

1. Use the default Start8 button look or a custom Start8 button look (e.g. win8start.png)
2. Move your mouse near the bottom left, then all the way to the hot corner

Result:

• The image animation of Start8's button cancels instantly and its image state is lost (hovered -> not hovered)
  This gives the impression that the Start menu button is no longer selected, but it appears otherwise.

Expected Result:

• The image animation of Start8's button should retain its state