How to fix corupted icons on home screen?
If you move an app to/from the sdcard, and you have icons on the home screen, you need to remove and re-add the icon to the home screen. when I have done this, I thought the icons removed themselves from the home screen automatically.

When you move it to/from the sdcard, it is a lot like uninstalling the application (without removing the user data) and re-installing it again in the new location.